diff --git a/CHANGELOG.md b/CHANGELOG.md
index b071274d36..cf3d82f701 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ ChangeLog (Release Notes)
 unreleased
 ----------
 * New: ユーザーページによく使うドメインを表示 (#771)
+* New: よくリプライするユーザーをユーザーページに表示 (#770)
 
 2566 (2017/09/07)
 -----------------
diff --git a/locales/en.yml b/locales/en.yml
index fd07be2aed..a7dd3aea23 100644
--- a/locales/en.yml
+++ b/locales/en.yml
@@ -499,6 +499,7 @@ mobile:
       activity: "Activity"
       keywords: "Keywords"
       domains: "Domains"
+      frequently-replied-users: "Frequently talking users"
       followers-you-know: "Followers you know"
       last-used-at: "Latest used at"
 
@@ -516,6 +517,10 @@ mobile:
     mk-user-overview-domains:
       no-domains: "No domains"
 
+    mk-user-overview-frequently-replied-users:
+      loading: "Loading"
+      no-users: "No users"
+
     mk-user-overview-followers-you-know:
       loading: "Loading"
       no-users: "No users"
diff --git a/locales/ja.yml b/locales/ja.yml
index 832390f5fe..451650ef76 100644
--- a/locales/ja.yml
+++ b/locales/ja.yml
@@ -499,6 +499,7 @@ mobile:
       activity: "アクティビティ"
       keywords: "キーワード"
       domains: "頻出ドメイン"
+      frequently-replied-users: "よく会話するユーザー"
       followers-you-know: "知り合いのフォロワー"
       last-used-at: "最終ログイン"
 
@@ -516,6 +517,10 @@ mobile:
     mk-user-overview-domains:
       no-domains: "よく表れるドメインは検出されませんでした"
 
+    mk-user-overview-frequently-replied-users:
+      loading: "読み込み中"
+      no-users: "よく会話するユーザーはいません"
+
     mk-user-overview-followers-you-know:
       loading: "読み込み中"
       no-users: "知り合いのユーザーはいません"
diff --git a/src/api/endpoints.ts b/src/api/endpoints.ts
index 97b98895b8..f05762340c 100644
--- a/src/api/endpoints.ts
+++ b/src/api/endpoints.ts
@@ -326,6 +326,9 @@ const endpoints: Endpoint[] = [
 		withCredential: true,
 		kind: 'account-read'
 	},
+	{
+		name: 'users/get_frequently_replied_users'
+	},
 
 	{
 		name: 'following/create',
diff --git a/src/api/endpoints/users/get_frequently_replied_users.ts b/src/api/endpoints/users/get_frequently_replied_users.ts
new file mode 100644
index 0000000000..2e0e2e40a7
--- /dev/null
+++ b/src/api/endpoints/users/get_frequently_replied_users.ts
@@ -0,0 +1,96 @@
+/**
+ * Module dependencies
+ */
+import $ from 'cafy';
+import Post from '../../models/post';
+import User from '../../models/user';
+import serialize from '../../serializers/user';
+
+module.exports = (params, me) => new Promise(async (res, rej) => {
+	// Get 'user_id' parameter
+	const [userId, userIdErr] = $(params.user_id).id().$;
+	if (userIdErr) return rej('invalid user_id param');
+
+	// Lookup user
+	const user = await User.findOne({
+		_id: userId
+	}, {
+		fields: {
+			_id: true
+		}
+	});
+
+	if (user === null) {
+		return rej('user not found');
+	}
+
+	// Fetch recent posts
+	const recentPosts = await Post.find({
+		user_id: user._id,
+		reply_to_id: {
+			$exists: true,
+			$ne: null
+		}
+	}, {
+		sort: {
+			_id: -1
+		},
+		limit: 1000,
+		fields: {
+			_id: false,
+			reply_to_id: true
+		}
+	});
+
+	// 投稿が少なかったら中断
+	if (recentPosts.length === 0) {
+		return res([]);
+	}
+
+	const replyTargetPosts = await Post.find({
+		_id: {
+			$in: recentPosts.map(p => p.reply_to_id)
+		},
+		user_id: {
+			$ne: user._id
+		}
+	}, {
+		fields: {
+			_id: false,
+			user_id: true
+		}
+	});
+
+	const repliedUsers = {};
+
+	// Extract replies from recent posts
+	replyTargetPosts.forEach(post => {
+		const userId = post.user_id.toString();
+		if (repliedUsers[userId]) {
+			repliedUsers[userId]++;
+		} else {
+			repliedUsers[userId] = 1;
+		}
+	});
+
+	// Calc peak
+	let peak = 0;
+	Object.keys(repliedUsers).forEach(user => {
+		if (repliedUsers[user] > peak) peak = repliedUsers[user];
+	});
+
+	// Sort replies by frequency
+	const repliedUsersSorted = Object.keys(repliedUsers).sort((a, b) => repliedUsers[b] - repliedUsers[a]);
+
+	// Lookup top 10 replies
+	const topRepliedUsers = repliedUsersSorted.slice(0, 10);
+
+	// Make replies object (includes weights)
+	const repliesObj = await Promise.all(topRepliedUsers.map(async (user) => ({
+		user: await serialize(user, me, { detail: true }),
+		weight: repliedUsers[user] / peak
+	})));
+
+	// Response
+	res(repliesObj);
+});
diff --git a/src/web/app/mobile/tags/index.js b/src/web/app/mobile/tags/index.js
index 6f985a91fd..c5aafd20ba 100644
--- a/src/web/app/mobile/tags/index.js
+++ b/src/web/app/mobile/tags/index.js
@@ -49,3 +49,4 @@ require('./users-list.tag');
 require('./user-following.tag');
 require('./user-followers.tag');
 require('./init-following.tag');
+require('./user-card.tag');
diff --git a/src/web/app/mobile/tags/init-following.tag b/src/web/app/mobile/tags/init-following.tag
index d0b63ff5db..6357f86a29 100644
--- a/src/web/app/mobile/tags/init-following.tag
+++ b/src/web/app/mobile/tags/init-following.tag
@@ -1,16 +1,9 @@
 <mk-init-following>
 	<p class="title">気になるユーザーをフォロー:</p>
 	<div class="users" if={ !fetching && users.length > 0 }>
-		<div class="user" each={ users }>
-			<header style={ banner_url ? 'background-image: url(' + banner_url + '?thumbnail&size=1024)' : '' }>
-				<a href={ '/' + username }>
-					<img src={ avatar_url + '?thumbnail&size=200' } alt="avatar"/>
-				</a>
-			</header>
-			<a class="name" href={ '/' + username } target="_blank">{ name }</a>
-			<p class="username">@{ username }</p>
-			<mk-follow-button user={ this }/>
-		</div>
+		<virtual each={ users }>
+			<mk-user-card user={ this } />
+		</virtual>
 	</div>
 	<p class="empty" if={ !fetching && users.length == 0 }>おすすめのユーザーは見つかりませんでした。</p>
 	<p class="fetching" if={ fetching }><i class="fa fa-spinner fa-pulse fa-fw"></i>読み込んでいます<mk-ellipsis/></p>
@@ -37,49 +30,10 @@
 				padding 16px
 				background #eee
 
-				> .user
-					display inline-block
-					width 200px
-					text-align center
-					border-radius 8px
-					background #fff
-
+				> mk-user-card
 					&:not(:last-child)
 						margin-right 16px
 
-					> header
-						display block
-						height 80px
-						background-color #ddd
-						background-size cover
-						background-position center
-						border-radius 8px 8px 0 0
-
-						> a
-							> img
-								position absolute
-								top 20px
-								left calc(50% - 40px)
-								width 80px
-								height 80px
-								border solid 2px #fff
-								border-radius 8px
-
-					> .name
-						display block
-						margin 24px 0 0 0
-						font-size 16px
-						color #555
-
-					> .username
-						margin 0
-						font-size 15px
-						color #ccc
-
-					> mk-follow-button
-						display inline-block
-						margin 8px 0 16px 0
-
 			> .empty
 				margin 0
 				padding 16px
diff --git a/src/web/app/mobile/tags/user-card.tag b/src/web/app/mobile/tags/user-card.tag
new file mode 100644
index 0000000000..d0c79698c5
--- /dev/null
+++ b/src/web/app/mobile/tags/user-card.tag
@@ -0,0 +1,55 @@
+<mk-user-card>
+	<header style={ user.banner_url ? 'background-image: url(' + user.banner_url + '?thumbnail&size=1024)' : '' }>
+		<a href={ '/' + user.username }>
+			<img src={ user.avatar_url + '?thumbnail&size=200' } alt="avatar"/>
+		</a>
+	</header>
+	<a class="name" href={ '/' + user.username } target="_blank">{ user.name }</a>
+	<p class="username">@{ user.username }</p>
+	<mk-follow-button user={ user }/>
+	<style>
+		:scope
+			display inline-block
+			width 200px
+			text-align center
+			border-radius 8px
+			background #fff
+
+			> header
+				display block
+				height 80px
+				background-color #ddd
+				background-size cover
+				background-position center
+				border-radius 8px 8px 0 0
+
+				> a
+					> img
+						position absolute
+						top 20px
+						left calc(50% - 40px)
+						width 80px
+						height 80px
+						border solid 2px #fff
+						border-radius 8px
+
+			> .name
+				display block
+				margin 24px 0 0 0
+				font-size 16px
+				color #555
+
+			> .username
+				margin 0
+				font-size 15px
+				color #ccc
+
+			> mk-follow-button
+				display inline-block
+				margin 8px 0 16px 0
+
+	</style>
+	<script>
+		this.user = this.opts.user;
+	</script>
+</mk-user-card>
diff --git a/src/web/app/mobile/tags/user.tag b/src/web/app/mobile/tags/user.tag
index a323559218..f29f0a0c86 100644
--- a/src/web/app/mobile/tags/user.tag
+++ b/src/web/app/mobile/tags/user.tag
@@ -246,6 +246,12 @@
 			<mk-user-overview-domains user={ user }/>
 		</div>
 	</section>
+	<section class="frequently-replied-users">
+		<h2><i class="fa fa-users"></i>%i18n:mobile.tags.mk-user-overview.frequently-replied-users%</h2>
+		<div>
+			<mk-user-overview-frequently-replied-users user={ user }/>
+		</div>
+	</section>
 	<section class="followers-you-know" if={ SIGNIN && I.id !== user.id }>
 		<h2><i class="fa fa-users"></i>%i18n:mobile.tags.mk-user-overview.followers-you-know%</h2>
 		<div>
@@ -619,6 +625,58 @@
 	</script>
 </mk-user-overview-domains>
 
+<mk-user-overview-frequently-replied-users>
+	<p class="initializing" if={ initializing }><i class="fa fa-spinner fa-pulse fa-fw"></i>%i18n:mobile.tags.mk-user-overview-frequently-replied-users.loading%<mk-ellipsis/></p>
+	<div if={ !initializing && users.length > 0 }>
+		<virtual each={ users }>
+			<mk-user-card user={ this.user }/>
+		</virtual>
+	</div>
+	<p class="empty" if={ !initializing && users.length == 0 }>%i18n:mobile.tags.mk-user-overview-frequently-replied-users.no-users%</p>
+	<style>
+		:scope
+			display block
+
+			> div
+				overflow-x scroll
+				-webkit-overflow-scrolling touch
+				white-space nowrap
+				padding 8px
+
+				> mk-user-card
+					&:not(:last-child)
+						margin-right 8px
+
+			> .initializing
+			> .empty
+				margin 0
+				padding 16px
+				text-align center
+				color #aaa
+
+				> i
+					margin-right 4px
+
+	</style>
+	<script>
+		this.mixin('api');
+
+		this.user = this.opts.user;
+		this.initializing = true;
+
+		this.on('mount', () => {
+			this.api('users/get_frequently_replied_users', {
+				user_id: this.user.id
+			}).then(x => {
+				this.update({
+					users: x,
+					initializing: false
+				});
+			});
+		});
+	</script>
+</mk-user-overview-frequently-replied-users>
+
 <mk-user-overview-followers-you-know>
 	<p class="initializing" if={ initializing }><i class="fa fa-spinner fa-pulse fa-fw"></i>%i18n:mobile.tags.mk-user-overview-followers-you-know.loading%<mk-ellipsis/></p>
 	<div if={ !initializing && users.length > 0 }>