It happened to me on Craigslist, but it could be on any site that you’re looking for a rental home. I listed a rental on Craigslist and got some results. Then one of the people I was considering told me that someone else had it listed, too, and at a lower price. When I hunted it up, I saw my address, my pictures, my description, and NOT my price. That scammer could easily take inquiries and trap people into giving them first/last month and deposit up front–then disappear, leaving the people not having rented a place but out of a bunch of money.
So…be careful! Be SURE you’re talking to the actual owner.