Well why don't you check your ad copy and your landing page? You might have violated Google adwords ToS. And I'm not sure advertising in Facebook through adsense is effective. Try facebook ads.
This is really wierd stuff. I have a content onlytargetted campaign. I have selected placements. I have only selected one site to target. YouTube. I am now starting to get a few impressions, but these are on other "Other placements on the content network" How can that happen, I have chosen only 1 site to target?? I sent an email to Google but just got a meaningless standard reply that was of no help whatsoever.