Trulia pulls their info from the MLS system (database for homes for sale) all Selling Agents put the homes here. If the Selling agent feels like marketing/advertise a persons home to Buyers searching Trulia they pay to feature etc. I personally like Trulia and always pay to feature my Sellers homes. I feel my job is to Sell the property and advertising is part if the investment (what we get paid for). Everyone has their opinion.
As a Buyer, I would suggest you find an agent that works only for you. The listing agent has a contract to hold their Sellers best interest.
Email or call me anytime,
Jessica Buck-Keller Williams Realty
Berkshire Hathaway HomeServices
Beverly Hills, CA
I am an agent from the north Knoxville area and I work for Keller Williams Realty.
When you are looking for additional information it is not necessary for you to call the listing agent for additional information. You can call the agent of your choice and they should be able to help you. It is actually much better for you to pick a particular agent that you would like to work with and then direct all of your inquiries to them, rather than the listing agent. This way they become familiar with you and your needs and they can perhaps find you the property that you are looking for.
Please feel free to email me at firstname.lastname@example.org or call 865-544-8597 with any questions you may have on any property.