OK, twitter.com is the rage of the first half of 2007. Maybe Facebook.com hits the same growth rate for the second half of 2007. Who knows with this fickle world of social networking.
The “@”-sign is used to respond to people on twitter, and is completely user-invented:
That is, if you write “@nickhodge blah blah blah”, there is a magic URL added to nickhodge.
Now, this message is sent to the public, but only friends of @nickhodge and you see the response. That is, if person-y is your friend and not nickhodge, they will not see your @nickhodge response.
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