This is absolutely rampant in the blackhat marketing world, (where I used to dabble, but still stay up on mostly out of curiosity). The model goes like this: Watch a few different pages and try to identify something that's bubbling up - that can be different viral facebook pages, reddit, whatever... there are a few different ways, but basically you constantly ping and scrape and try to identify stuff that's going vir…
Interesting. But after scraping the viral content, how do they get people to go to their page instead of the original? Does this work in tandem with gaming Google, so that searches for the viral keywords will get results with the blackhats on the first page?
The most spammy ones use clickjacking; basically they throw up something that covers the page with an ad (or a "like us on facebook" prompt), and use some JS to turn a click anywhere on the site into a facebook like. That's playing with fire though, as most of those pages get flagged and shut down.
They do get a little bit of traffic from Google because their social reach is extreme (one of the bigger things Google looks for now) but it's around 85% pure Facebook traffic