I highly recommend the Caitlin Dewey's Intersect bog, where she writes about Digital and Internet Culture for the Washington Post. On Fridays, she gathers and discussed the week's worth of notable hoaxes in one "What was fake on the internet this week..." post.
Simply reading these posts on a regular basis might give you a better idea about how and why "fake stuff" gets published and shared, otherwise, you may want to read Cabel Gathem's "Why People Fall for Dumb Internet Hoaxes", via The Daily Dot.
Wanting to know if something on the internet is a hoax or fraud?
Start with what you already know about evaluating information, with emphasis on the two A's in TRAAped:
Still stumped? Give these collective fraud detection and truth seeking sites a try!
Courtesy of AllSides.com