This is a really good article from a January issue of The New Yorker that describes the type of calculated methods that are used to grab your attention on Facebook.
From the article:
"As new-media companies like BuzzFeed and Upworthy become established brands, [virology virtuoso Emerson] Spartz hopes to disrupt the disrupters. He employs three dozen people full time, in addition to several freelancers. The company operates thirty sites, which have no unifying aesthetic. Their home pages, which can be chaotic and full of old links, don’t always feature a Spartz logo; traffic is generated almost entirely through Facebook, so brand recognition is relatively unimportant. Most of the company’s innovations concern not the content itself but how it is promoted and packaged: placing unusually large share buttons at the top and the bottom of posts; experimenting with which headlines and photographs would be more seductive; devising strategies for making posts show up prominently in Facebook’s news feed."
"The best minds of my generation are thinking about how to make people click ads. That sucks." -- Jeff Hammerbacher, former Research Scientist at Facebook (one of the first 100 employees)