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@@ -1,8 +1,8 @@
 title: Twitter & Co.
 date: 2009-11-19 16:07:00 
-updated: 2014-08-29 20:19:49 
+updated: 2017-09-16 19:45:29 
 author: presse
-tags: twitter, diaspora, quitter
+tags: twitter, diaspora, quitter, social media
 
 The Chaos Computer Club comments sometimes news and publishes event
 information, all press statements as well as hacker humor
@@ -10,3 +10,11 @@ via [quitter](https://quitter.se/ccc) und
 [Twitter](http://twitter.com/chaosupdates), also via Diaspora:
 [chaosupdates\@diasp.org](https://diasp.org/u/chaosupdates). We are not
 on Facebook.
+
+**Event hashtag**
+
+For the annual [Chaos Communication
+Congress](https://en.wikipedia.org/wiki/Chaos_Communication_Congress) an
+abbreviation is traditionally used as a hashtag. For example: For the
+33rd Congress in 2016 the hashtag \#33C3 was used. In 2017, when in
+December the 34th Congress will take place, the hashtag will be \#34C3.