[qi:020] If you are looking for an escort, then you might want to turn to Facebook. It is one of the services that is being promoted via Facebook Flyers, Facebook’s own ad-service. (Readers tell us they have been around for about 18 months, though off late we are seeing more of them.) It is not cheap – you pay $10 per 5000 impressions. Will this be the Facebook’s version of AdSense? Meanwhile others are trying their own versions of ads-within-Facebook apps. Rock You, a Palo Alto-based start-up, has started to play around and using its FB-rank to make money. There is some talk, that Rock You is going to charge lesser-known app developer and will promote them inside their app.