Your real estate company has to have a strong internet presence to be indexed on all sites, which is important, since not all homebuyers look in the same place. For example, Weichert has agreements with Realtor.com, Homes.Com, RealEstate.com,and RealEstate.Yahoo.com. Now, these sites also index to Trulia.com, Zillow.com, Move.com, and others. Next, I also manually input on places like Craigslist, HotPads, Facebook, MySpace, HotProp, and dozens of others. It's a lot of work, but VERY necessary to have this marketing in place.