It makes sense in a chatroom if you direct a message @someone (at someone), or i...

		varun_ch 6 days ago \| parent \| context \| favorite \| on: Unsung heroes: Flickr's URLs scheme It makes sense in a chatroom if you direct a message @someone (at someone), or if you direct a tweet @someone. So I guess the natural progression of that is @someone becoming the identifier.

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