Another downturn... NMA - Facebook's UK unique user numbers have dropped for a second month in a row. The fall to 8.3m unique users in February from December's 8.9m puts an end to the social network's rocketing success.
There is a middle ground between pay-per-click and straight banner adverts. I personally have found PPC is now too saturated which has driven up prices.
I agree you don't have the intent, but as socially-held information becomes more detailed, you should be able to profile better.
I ran a personal test with Facebook social adverts over the past two weeks and have had a much better ROI than with Google Adwords campaigns running. I think this will also become more competitive, pushing up the prices, but it offers good value at the moment.