Well the only way to find out for sure would be to ask Trulia and they might not want to divulge that info. I assume that they track the hits like most people do and use a service like Google Analytics. If your home is listed with a Realtor and member of the Lehigh Valley Assoc. of Realtors, your Realtor can tell you what kind of traffic your home's listing is getting where it matters on the MLS website. I hope this helps.