 3Taps and PadMapper were companies that partnered to provide an alternative user interface for browsing Craigslist's housing ads.In doing so, they scraped Craigslist's site for data, which Craigslist did not approve of.Craigslist sent both companies a cease-and-desist letter and blocked their IP addresses, but this did not stop 3Taps from scraping through other IP addresses.