You probably know not to post things online that could bite you later, but many of us do it all the time anyway—often without even realizing it. Whether it's a friend tagging you in a photo or admitting you torrent your movies in a Facebook status, even innocuous posts or photos can damage your relationships, get you in trouble at work, or even land you in legal hot water. Here's what we mean, and how to stop.

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Redditor Ventachinkway caught a photo of a homeless man conducting a clever exercise in behavioral economics disguised as an inquiry into the levels of spontaneous generosity as determined by religious creed or lack thereof.

When I passed him he proudly announced "The atheists are winning!" (i.imgur.com) (via Glinner)