Because it is on the MLS, the information will feed to many sites automatically...Trulia being one.
Given you chose to have someone put it on the MLS, there is nothing you can do about where the information automatically feeds.
Best of luck in selling your home,
Mark & Kari Shea
Shea Real Estate
Home Sales Specialists; New and Resale Homes
Property Valuation Specialists
Land Sales, Acquisitions & Consulting
Serving Greater San Diego
John Finley, Broker
Shapiro Finley Fine Homes
Del Mar Realty Associates