What it does: 

Send and receive messages to and from mobile phones (by SMS), webpages, or from IM/Jabber/gchat. Send messages to a group of 'followers' or send direct messages to one person.

When to use it: 

To send out developments of a campaign or action to people's mobile phones.

When not to use it: 

For lengthy commmunication


If you are using Twitter through your mobile phone, it has local numbers for use in the USA, Canada and India. You can use Twitter through the web anywhere in the world where there is an internet connection.


You can 'protect your updates' and authorise 'followers' who are then allowed to see your messages.


Limited, like text, to 140 characters per message.

Suggested use: 

Its a lightweight mass-SMS sending system so it can be updated (and read) via mobile phone, and can reach people working in emergency situations in a way the internet cannot.

Advocacy example: 

Alaa's Twitter feed (http://twitter.com/alaa) has used twitter to effectively to coordinate protests in Cairo.

Owned by: 
Your content: 

They claim 'What's yours is yours'

Security concerns: 

There has been some concern over privacy and authentication methods on twitter. Caution is advised in putting sensitive information over twitter. See http://blog.spywareguide.com/2007/04/first_spoofing_attacks_against.html for more info.