On the DiRT Directory: http://dirtdirectory.org/node/216
Twitter allows users to send 140-character messages. There is a thriving digital humanities community of Twitter users. This tool is great for communicating and sharing ideas, micro-blogging, real-time communication. You can follow tweets about digital humanities https://twitter.com/hashtag/digitalhumanities.
Explore more tools from DiRT on the Digital Tools Directory.