diff --git a/zephyr/static/js/ui.js b/zephyr/static/js/ui.js
index 9e8817ca7d..e884605f71 100644
--- a/zephyr/static/js/ui.js
+++ b/zephyr/static/js/ui.js
@@ -712,7 +712,9 @@ function collapse(row) {
 }
 
 var current_stream_sidebar_elem;
+var current_user_sidebar_elem;
 var stream_sidebar_popup_shown_this_click = false;
+var user_sidebar_popup_shown_this_click = false;
 
 exports.hide_stream_sidebar_popover = function () {
     if (ui.stream_sidebar_currently_popped()) {
@@ -721,6 +723,17 @@ exports.hide_stream_sidebar_popover = function () {
     }
 };
 
+exports.hide_user_sidebar_popover = function () {
+    if (ui.user_sidebar_currently_popped()) {
+        current_user_sidebar_elem.popover("destroy");
+        current_user_sidebar_elem = undefined;
+    }
+};
+
+exports.user_sidebar_currently_popped = function () {
+    return current_user_sidebar_elem !== undefined;
+};
+
 exports.stream_sidebar_currently_popped = function () {
     return current_stream_sidebar_elem !== undefined;
 };
@@ -1238,6 +1251,46 @@ $(function () {
         e.preventDefault();
     });
 
+    $('body').on('click', '.user_sidebar_entry', function (e) {
+        var last_sidebar_elem = current_user_sidebar_elem;
+        ui.hide_user_sidebar_popover();
+        user_sidebar_popup_shown_this_click = true;
+
+        var email = $(e.target).find('a').attr('data-email');
+        var name = $(e.target).find('a').text();
+
+        $(e.target).popover({
+            content:   templates.render('user_sidebar_actions', {'email': email,
+                                                                 'name': name}),
+            placement: "left",
+            trigger:   "manual"
+        });
+        $(e.target).popover("show");
+        current_user_sidebar_elem = $(e.target);
+        e.preventDefault();
+    });
+
+    $('body').on('click', '.user_popover .narrow_to_private_messages', function (e) {
+        var email = $(e.target).parents('ul').attr('data-email');
+        ui.hide_user_sidebar_popover();
+        narrow.by('pm-with', email, {select_first_unread: true, trigger: 'user sidebar popover'});
+        e.stopPropagation();
+    });
+
+    $('body').on('click', '.user_popover .narrow_to_messages_sent', function (e) {
+        var email = $(e.target).parents('ul').attr('data-email');
+        ui.hide_user_sidebar_popover();
+        narrow.by('sender', email, {select_first_unread: true, trigger: 'user sidebar popover'});
+        e.stopPropagation();
+    });
+
+    $('body').on('click', '.user_popover .compose_private_message', function (e) {
+        var email = $(e.target).parents('ul').attr('data-email');
+        ui.hide_user_sidebar_popover();
+        compose.start('private', {"private_message_recipient": email, trigger: 'sidebar user actions'});
+        e.stopPropagation();
+    });
+
     $('#stream_filters').on('click', 'span.arrow', function (e) {
         var last_sidebar_elem = current_stream_sidebar_elem;
         ui.hide_stream_sidebar_popover();
@@ -1475,7 +1528,11 @@ $(function () {
             if (stream_sidebar_popup_shown_this_click === false ) {
                 ui.hide_stream_sidebar_popover();
             }
+            if (user_sidebar_popup_shown_this_click === false ) {
+                ui.hide_user_sidebar_popover();
+            }
             stream_sidebar_popup_shown_this_click = false;
+            user_sidebar_popup_shown_this_click = false;
         }
 
         // Unfocus our compose area if we click out of it. Don't let exits out
diff --git a/zephyr/static/styles/zephyr.css b/zephyr/static/styles/zephyr.css
index 525a65c187..c76675b8f9 100644
--- a/zephyr/static/styles/zephyr.css
+++ b/zephyr/static/styles/zephyr.css
@@ -217,6 +217,14 @@ a:hover code {
     overflow-y: auto;
 }
 
+#user_presences li:hover {
+    background-color: lightgrey;
+}
+
+#user_presences .user_sidebar_entry:hover {
+    cursor: pointer;
+}
+
 #user_presences li {
     overflow: hidden;
     white-space: nowrap;
@@ -235,6 +243,18 @@ a:hover code {
     list-style-image: url(/static/images/presence/user-idle.png);
 }
 
+#user_presences .arrow {
+    font-size: 1em;
+    width: 2em;
+}
+#user_presences .arrow-real {
+    display: none;
+}
+#user_presences li:hover .arrow-real {
+    display: inline;
+    cursor: pointer;
+}
+
 #user_presences a {
     color: #333;
 }
diff --git a/zephyr/static/templates/stream_sidebar_actions.handlebars b/zephyr/static/templates/stream_sidebar_actions.handlebars
index dde07db8a5..138cb5cdb6 100644
--- a/zephyr/static/templates/stream_sidebar_actions.handlebars
+++ b/zephyr/static/templates/stream_sidebar_actions.handlebars
@@ -1,4 +1,4 @@
-{{! Contents of the "message actions" popup }}
+{{! Contents of the "stream actions" popup }}
 <ul class="nav nav-list streams_popover" data-id="{{ stream.id }}" data-name="{{ stream.name }}">
   <li>
     <a class="narrow_to_stream">
diff --git a/zephyr/static/templates/user_sidebar_actions.handlebars b/zephyr/static/templates/user_sidebar_actions.handlebars
new file mode 100644
index 0000000000..ae9444a671
--- /dev/null
+++ b/zephyr/static/templates/user_sidebar_actions.handlebars
@@ -0,0 +1,22 @@
+{{! Contents of the "user actions" popup }}
+<ul class="nav nav-list user_popover" data-email="{{email}}">
+  <li>
+    <a class="narrow_to_private_messages">
+      <i class="icon-vector-user"></i>
+      Narrow to private messages with {{name}}
+    </a>
+  </li>
+  <li>
+    <a class="narrow_to_messages_sent">
+      <i class="icon-vector-bullhorn"></i>
+      Narrow to messages sent by {{name}}
+    </a>
+  </li>
+  <li>
+    <a class="compose_private_message">
+      <i class="icon-vector-edit"></i>
+      Compose a message to {{name}}
+    </a>
+  </li>
+
+</ul>