Facebook has always converted well for me. However, it takes time, patience, and money to really start playing ball - just like with adwords.
You have keep on track with your conversion rates, image colors, ad titles..etc, and have a few dozen going at once on rotation. Then you will also have a better conversion rate if you segregate your ads...such as make certain ads for woman (such as white, purple, pink..etc) and having the titles directed more towards emotion. Then with men you would want bold (black, orange, yellow..etc (!!never red!!)) - along with more direct and less "fluffy" titles as to what you can instantly do for them and what they instantly get out of it or by clicking on your ad.
I actually prefer directing the ads towards my facebook page and grabbing friends or "Likes". That way I can do "sponsored" posts at a MUCH cheaper cost and higher rate of conversion.