I'm sure people nowadays know a lot about microblogging, I mean after the mass protests in Iran. Twitter, Watwet , Jaiku or any of their brothers are quit useful.
After using twitter for a year or more, I find it helpful to give some tips:
- 140 characters are not always enough for telling a story: you should use hyperlinks and some other ways ;)
- I am not sure that my followers are following my tweeted hyperlinks : make your messages give a complete sentence
- Make a topic on Twitter: simply by adding # before a key word for the cause
- Tweet in 2 language (or more) if possible
- Alert people to when your blog entry is Photos or Videos
- Tweet your pictures!
- See who is following you; he/she may be someone working for the same cause

