In an investigative forum of Reddit.com, since removed from the site, users compiled thousands of photos, studied them for suspicious backpacks and sent their favorite theories spinning out into the wider Internet.
"Find people carrying black bags," wrote the Reddit forum's unnamed moderator. "If they look suspicious, then post them. Then people will try and follow their movements using all the images."
The moderator defended this strategy by arguing that "it's been proven that a crowd of thousands can do things like this much quicker and better. ... I'd take thousands of people over a select few very smart investigators any day."
In addition to being almost universally wrong, the theories developed via social media complicated the official investigation, according to law enforcement officials. Those officials said Saturday that the decision on Thursday to release photos of the two men in baseball caps was meant in part to limit the damage being done to people who were wrongly being targeted as suspects in the news media and on the Internet.
Don't forget to vote in Reddit co-founder Alexis Ohanian as President of the Internet!