I feel it's not as cut and dry as you are trying to make it seem. Imagine if this were a 3rd party Facebook client that stripped out the ads, I bet Facebook would sue you. Just last year there was the legal battle between Padmapper and Craigslist. The case got thrown out [0] but only after Padmapper did some sneaky stuff so that it wasn't scraping craigslist directly. Also because craigslist didn't own full copyrights to the listings because they were user generated.
