Margie - scroll down a bit, read some previous responses and you won't have to "guess" what has occurred - the home in question is now a "for sale by owner", and Trulia doesn't have fsbo listings on their site. Zillow does allow fsbo's.
Also, just so you know, homes DO get "automatically" listed here on trulia - they are fed via the MLS . Agents can edit their listings further and add more information, but the listing is already here.
I see you're new to trulia (welcome onboard), but perhaps it would be a good idea to become familiar with the site before giving incorrect site information, which might only serve to confuse the consumer rather than answer their question.
It's also a good idea, imo, to read at least a few of the previous responses, so that you're in the loop as far as what has already been shared.