@Nick Ferrari when I listed my property back in March, I got the most "hits" off of facebook and from a sign in the yard. If you use facebook though, be prepared to get a lot of messages saying "Is this available?" Facebook has a button or something that prompts potential renters to use that as their first response to your ad, I know some people get annoyed with it. Also, although I had a ton of response on FB, about 80% weren't interested once they found out the details of the property even though those details were already listed in the FB ad. So if I were you I'd have a pre-written first response ready to copy-paste as a reply, something along the lines of:
"Hi XYZ, yes the property is currently available. As the ad states, it is a 3 bed, 2 bath, 1800 sq ft single family house in Allentown listed at $900/month. The property is non-smoking and we do allow dogs (limit 2) depending on breed. We are looking for applicants with 650+ credit scores, no prior evictions, no criminal record, and with monthly income equal to 3 x monthly rent. Would you like to schedule a tour?"
The response to this will often be "oh I didn't realize that" or "oh I can't afford that", so this will keep you from wasting much time on the 80% who aren't serious or wouldn't qualify and didn't bother to read your original ad. Good luck!