I’m working on a website where I need to prefill a certain message in the ‘What are you doing?’ textarea from Twitter.
Here is the solution … redirect the user to :
http://twitter.com/home?status=YOUR_URL_ENCODED_MESSAGE
for example : http://twitter.com/home?status=this%20is%20a%20test
Hope this will help someone 
Works like a charm! Thanks
Twitter is some ways is much better than blogging. I love to Twitter my everyday activities on my friends and relatives.
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Can this be done on facebook?
Thanks a lot.
I’m actually trying to figure out if you can do something like this on Facebook as well. I want an easy way to let someone send me a message on FB just be clicking on a link that goes to FB with the message destination filled in. I suspect that digging into the FB share API might reveal something, but I haven’t looked into yet.