Unfortunately scammers find properties that are for sale, copy the photos, description, etc. and list them for rent usually on Craigslist but I guess now they are doing it on Trulia too. They then ask for a deposit and then they vanish. Did you hit the flag button on the listing to notify Trulia that's this rental is fraud?
If you are looking for a rental I suggest working with an agent. If not, never give anyone a deposit over the internet for a home.