Did you post an ad on Craigslist between July 26, 2012, and August 8, 2012?” the blog post asks. “If so, bad news for you. Turns out that Craigslist, and not you, owns that ad. In other words, if you try to repost it to another site, you could actually be infringing Craigslist’s copyright. Sound ridiculous? We think so, too.