diff --git a/_config.yml b/_config.yml
index 3758dfb..7254587 100644
--- a/_config.yml
+++ b/_config.yml
@@ -33,7 +33,6 @@ header_pages:
 # external links are in _includes/header.html
 
 
-twitter_username: code4lib
 github_username:  code4lib
 youtube_username: code4lib
 mastodon_instance: code4lib.social
diff --git a/_includes/social.html b/_includes/social.html
index 4d45579..cf50c4a 100644
--- a/_includes/social.html
+++ b/_includes/social.html
@@ -7,8 +7,7 @@
     {%- if site.linkedin_username -%}<li><a href="https://www.linkedin.com/in/%7B%7B%20site.linkedin_username|%20cgi_escape%20|%20escape%20%7D%7D"><svg class="svg-icon"><use xlink:href="https://github.com/%7B%7B'/assets/minima-social-icons.svg#linkedin' | relative_url }}"></use></svg> <span class="username">{{ site.linkedin_username| escape }}</span></a></li>{%- endif -%}
     {%- if site.pinterest_username -%}<li><a href="https://www.pinterest.com/%7B%7B%20site.pinterest_username|%20cgi_escape%20|%20escape%20%7D%7D"><svg class="svg-icon"><use xlink:href="https://github.com/%7B%7B'/assets/minima-social-icons.svg#pinterest' | relative_url }}"></use></svg> <span class="username">{{ site.pinterest_username| escape }}</span></a></li>{%- endif -%}
     {%- if site.mastodon_instance -%}<li><a href="https://{{ site.mastodon_instance| cgi_escape | escape}}"><svg class="svg-icon"><use xlink:href="https://github.com/%7B%7B'/assets/minima-social-icons.svg#mastodon' | relative_url }}"></use></svg> <span class="username">{{ site.mastodon_instance| escape }}</span></a></li>{%- endif -%}
-    {%- if site.twitter_username -%}<li><a href="https://twitter.com/%7B%7B%20site.twitter_username|%20cgi_escape%20|%20escape%20%7D%7D"><svg class="svg-icon"><use xlink:href="https://github.com/%7B%7B'/assets/minima-social-icons.svg#twitter' | relative_url }}"></use></svg> <span class="username">{{ site.twitter_username| escape }}</span></a></li>{%- endif -%}
     {%- if site.youtube_username -%}<li><a href="https://www.youtube.com/%7B%7B%20site.youtube_username|%20cgi_escape%20|%20escape%20%7D%7D"><svg class="svg-icon"><use xlink:href="https://github.com/%7B%7B'/assets/minima-social-icons.svg#youtube' | relative_url }}"></use></svg> <span class="username">{{ site.youtube_username| escape }}</span></a></li>{%- endif -%}
     {%- if site.googleplus_username -%}<li><a href="https://plus.google.com/%7B%7B%20site.googleplus_username|%20escape%20%7D%7D"><svg class="svg-icon"><use xlink:href="https://github.com/%7B%7B'/assets/minima-social-icons.svg#googleplus' | relative_url }}"></use></svg> <span class="username">{{ site.googleplus_username| escape }}</span></a></li>{%- endif -%}
     {%- if site.rss -%}<li><a href="https://github.com/%7B%7B'feed.xml' | relative_url }}"><svg class="svg-icon"><use xlink:href="https://github.com/%7B%7B'/assets/minima-social-icons.svg#rss' | relative_url }}"></use></svg> <span>{{ site.rss | escape }}</span></a></li>{%- endif -%}
-  </ul>
\ No newline at end of file
+  </ul>
diff --git a/_pages/about.md b/_pages/about.md
index c24bea9..48dfdcd 100644
--- a/_pages/about.md
+++ b/_pages/about.md
@@ -17,4 +17,4 @@ code4lib grew out of other efforts such as the <a href="http://etig.wordpress.co
 
 Things get done because people share ideas, step up to lead, and work together, not because anyone is in charge. We prefer to make community decisions by holding open votes, e.g. on who gets to present at our conferences, where to host them, etc. If you've got an idea or an itch to scratch, please join in; we welcome your participation!
 
-If you are interested in joining the community: sign up to the <a href="https://lists.clir.org/cgi-bin/wa?A0=CODE4LIB">discussion list</a>; join the <a href="https://www.facebook.com/group.php?gid=2239622626">Facebook</a> or <a href="http://www.linkedin.com/groups?gid=134499">LinkedIn</a> groups; <a href="https://plus.google.com/u/0/communities/114587042187424680647">Google+ community</a>; follow us on <a href="http://twitter.com/code4lib">Twitter</a>; subscribe to our <a href="http://planet.code4lib.org/">blogs</a>; or get right to the heart of it in the chat room on <a href="http://code4lib.org/irc">IRC</a>.
+If you are interested in joining the community: sign up to the <a href="https://lists.clir.org/cgi-bin/wa?A0=CODE4LIB">discussion list</a>; join the <a href="https://www.facebook.com/group.php?gid=2239622626">Facebook</a> or <a href="http://www.linkedin.com/groups?gid=134499">LinkedIn</a> groups; subscribe to our <a href="http://planet.code4lib.org/">blogs</a>; or get right to the heart of it in the chat room on <a href="http://code4lib.org/irc">IRC</a> or <a href="https://code4lib.slack.com/">Slack</a> (<a href="https://docs.google.com/forms/d/120Dw1JjLxPJB9VTGl0mUY7Ot6yg6YNY1RZUISJFzdwk/viewform?c=0&w=1">sign up here</a>).