I'm Andrew, a community manager for Trulia, and so can speak on Trulia's behalf.
Trulia's search results for real estate listings are indexed from agent/broker web pages. Our service is free, and there is no charge to have listings posted on Trulia. However, at this time we do not add For Sale By Owner listings.
We know that many people who have FSBO listings would like to put their listings on Trulia. Our site is undergoing many improvements to make our service more useful to you and I have sent your message to our specialists to make them aware of your request.
Thank you for your question Joe. I'm sorry that I couldn't help you further with this. If you have further questions or comments add them by clicking "Comment" below (in blue) or you can always email me directly at firstname.lastname@example.org