One of the main benefits, by the way, is that it should allow specific sites in the network to gain momentum.
For example, there isn't a good nsfw social bookmarking site around right now. A single webmaster without shitloads of traffic starting one, however, wouldn't work - there wouldn't be enough users and sites using it to create sufficient momentum.
If a single person in the network started one, however, the others could help feed it. In exchange, they'd profit from things like preferred submitter status - which would be extremely valuable once the site grew large enough.
The same goes for things like a non-porn nsfw tube, most image/message boards, etc.
For the people in the network doing smaller projects (blogs, prank sites, etc), the cooperation would mean far faster growth, and prospects of profiting from the growth of others.
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