I'm on three other sites regularly: Digg.com, MyBarackObama, and Myspace.
In the case of Myspace, you choose what you're going to read and deal with. You surround yourself with friends who agree with you and bounce antagonists and spammers. You don't get a real-time, real-life cross-section.
At MyBO, I'm surrounded by friendlies. We use our power-of-numbers to exclude and marginalize antagonists, with the exception of fools who we find amusing and then it's tolerated. That's not a real benchmarker, either.
Now Digg is where the striations happen! You can't really exclude contact with unfriendlies and antis, the best you can do is Bury their comments and, when you get involved in a big network of Friends and Fans, shout to each other about antagonistic and malicious postings and warn each other against bad actors. Digg is down-in-the-trenches politics.
And what's happening over at Digg...
I've identified these memes.
Last winter, we had to deal with the histrionics and cut-and-paste spamming of RON PAUL. He had the biggest following on Digg The Candidates, standing at around 18,000 fans, and they were out for blood. They cruised around in packs, attacking other candidates' friends with dogpile Buries, flame wars, attempting to entangle Diggers with low network ratings in red herring traps, and generally spamming every single political thread with scores if not hundreds of one-liners like "RON PAUL FOR PRESIDENT '08!" Very domineering. Then, in true sociopathic form, they whined about being misunderstood and picked on when people called them out on their s**t.
After the primaries were over, McCain's handlers saw that Digg was a potent tool and a potent threat, since his network was one of the smallest. They had hardcore Neocons go over and do like the Paulbots did, i.e. spam the boards and load up the front page with McCain-positive stories. The John McCain campaign took Obama's lead in giving points to people that did that, in exchange for campaign schwag. There's a rumour that Karl Rove
paid some of them, which would add racketeering to his list of crimes (in addition to Contempt of Congress).
The McCainites...heh...I just visualized him with fangs...

...seem to be using three lines of attack in their campaign.
=> One: Denigrate and bury any submitted article if it's from the Daily Kos, Huffington Post, Rawstory or Firedoglake.
=> Two: Bring up the usual Obama smears of "Socialist," "born a Muslim," "Where is his birth certificate? Where was he born?," the Reverend Wright scandal (personally I think Sarah Palin's minister is scarier than a hundred Rev. Wrights), "He has no experience," "He's leaving his half-brother to starve in a tin shack," and "Empty suit who does nothing but talk." One particularly nasty 'bot said after Barack's rally in Berlin, "I can think of another guy who inspired huge crowds in Germany by being a good talker," he got hung out to dry.
The latest smear is that Barack has connections with Ayers, a known terrorist. Yeah, he met the guy when he was 8 years old. A perennial favourite ruse is to say that we'll all be paying more taxes under him even though someone has put up a page that shows you what your Obama tax cut would be after you fill in a few income/family size fields.
=> Three: Bury any anti-McCain/Palin story "as inaccurate," even when — sometimes, especially — direct, contextual and explicit quotes and verifiable cites are involved. We think this is where Rove's Raiders were operating. Fortunately Digg recently changed their algorithm to prevent this kind of malicious gaming of the system.
And the old stand-by, resort to insults and vicious name-calling when all else fails. Which we read as "death throes" and proceed to mercilessly, double-digit bury their comments and report as offensive.
This is further complicated by the tinfoil-hat whonks who go around blathering "CFR, Zbigniew Brzinski, FISA vote" and the remnants of the Ron Paul Revolution 'bots. We just bury them when they get new e-mail accounts and re-register.
The only good thing I can say about this week's stock market crash is that it seems to be giving Barack a boost in the polls, since he indisputably has the better economic plan.