anon is a bot that watches changes in major language Wikipedias and tweets anonymous edits that come from particular IP address ranges, such as the US Congress, the UK Parliament, etc. You can find a list of some of the anon Twitter accounts you can follow here.
Rather than each Twitter account needing an anon instance to watch all the changes for the edits they are interested in, a single instance of anon is configured to watch the stream for multiple Twitter accounts. This instance runs in Wikimedia Tools Labs where it can be managed by more than just one person.
If you would like to have a Twitter account added, or help out with the project please get access to Tools Labs and request to be a member of the anon project by getting in touch with Ed Summers or by creating an issue ticket on Github.