This is manifested even in the examples he presented; being an online entity, who's to say that foul play wont occur? What is the system for checks and balances when poisoning the wells to gain followers? Look at Digg and Reddit:
Ostensibly, both sites serve the same purpose, and on a given day you'll very likely find links to the exact same controversial article. It's also likely you'll hear two completely different sides of the issue-one pro, one against, one conservative, one progressive, one rational, one emotional.
The American Nations isn't going to address anything, further segmenting people into groups only reinforces the idea that you need to be with people who agree with you, and rally against those who don't. It's giving the middle finger to compromise and collaboration among people with opposing viewpoints, we don't need further segmentation of ideologies, we really don't.
And I get that he's wanting a microcosm of progressive individuals who want to address major issues as they are, but creating a group within a group, that's already divided and indecisive about how policies shape their day to day lives isn't the answer. It's the pot calling the kettle black.
If you want to FIX America, start by teaching people to think for themselves and dislodge themselves from the meme that everything in the political arena has to be constructed under an "us versus them" mentality, and to not base their moral compasses on sound-bites and blogger pundits. Then you need to teach them how beneficial and enjoyable it can be to actually learn what the guy on the other side of the table has to say.
Stop playing sides. It's destroying us as a people.