All posts are public (except for direct messages), so you can go to @timcast and see what he's been posting without having to follow him or even sign up for anything.
You can also search Twitter at https://twitter.com/#!/search-home (though you'll have to copy and paste the link, since the software seems to want to cut it off after the !)
For example, a search on #ows gives you all the posts that include the hashtag "#ows." (A hashtag is just a simple method people use to make it easy to search for posts on a particular subject. It has the "#" in front of the name or abbreviation that people find it most natural to use for that subject, and it works surprisingly well.)
I just did that search and it brought up a bunch of current messages about the reoccupation of Zuccotti. (Dwayne_wins is another livestreamer, who I first noticed during the October snowstorm worrying that his feet were getting frostbitten. Newyorkist is a blogger who keeps pretty well up to date on Occupy doings in New York.)
Occupy Dwayne
Dwayne_wins Occupy Dwayne
Mic check: Ppl are staying the night. Bring blankets to Zucotti for the overnighters. No Marches tonight!! #ows www.livestream.com/owsnyc
1 hour ago
Newyorkist
Newyorkist Newyorkist
There are now 6 ppl lying down here in Zuccotti, maybe 150 ppl in park #ows twitpic.com/85uo06
1 hour ago
Nick Pinto
macfathom Nick Pinto
Here's my write-up of the #OWS re-occupation of Zuccotti Park tonight: bit.ly/y3IvrC
1 hour ago
Newyorkist
Newyorkist Newyorkist
Barricades line north wall of Zuccotti Park, where the library used to be. GA happening in background #ows twitpic.com/85ukyi
1 hour ago