The Chaos Computer Club comments sometimes news and publishes event information, all press statements as well as hacker humor via Mastodon und Bluesky, also via Diaspora: chaosupdates@diasp.org (will end in May 2025).

We are not on Facebook.

Event hashtag

For the annual Chaos Communication Congress (C3), traditionally a hashtag formed by combining the event's sequential number with the abbreviation C3 is used. For example, the hashtag #33C3 was used for the 33rd Congress in 2016. In 2025, for the 39th Congress, the hashtag will be #39C3.