What's hot

Seems we've gotta learn not just a new language but a new definition of hot.
And no; I'm not talking (this time) about Viggo Mortensen.
Although he sure is hot...
Lost my train of thought.

Oh.  Right.  Nearly every day there's a new social media site out there.
Which should we focus on and which can we forget?
Mediaweek just narrowed it down for us on their digital hotlist 2010 .  For now, looks like there are just 3  sites we need to put our money on and master--
Facebook, Twitter and Four Square.
Forget Viggo. We can master new media!