Yes, FACEBOOK now is overcrowded but still you have to post it for more chances.
Some of my friends told me this way is OK too.
GOOGLE and BING both offer a FREE listing for local business advertising.
Yahoo charges for local listing, but you get listed on a lot more if you buy their service.
The service called Yahoo Localworks, cost 29.99 a month and lists you in 50 directories including
YahooLocal, Yelp, White Pages, Bing, Mapquest and more..