Here’s Mary Kyle over at Learning 2.1
Mini or Micro Blogging
What is Mini Blogging? Where can I set one up? Why would I?
Mini blogs are limited to short messages (frequently 140 characters), they began as cell phone text messages limited to a geographic region that could be used to find your friends, find out what's going on in the area that night, or to invite your friends to all go to the latest Harry Potter movie on opening night together. The original miniblog, Dodgeball, has all but disappeared and isn't available in
The new mini-blogs are:
Twitter - your posts are called Tweets
Jaiku - allows you to set up groups and has easy search
Hictu - mostly popular in France, Italy, and England
Frazr - French and German
Pownce - allows the biggest posts and also can be used for file transfer (up to 10MB in the free version, sounds more like email) since an invite is required I can't find out much more about it.