You'd be surprised, but our entire service does not make a single request to the craigslist servers. We get the craigslist postings from the 3taps API, which t

You'd be surprised, but our entire service does not make a single request to the craigslist servers. We get the craigslist postings from the 3taps API, which themselves scrape Google Caches to import that data. The images are typically hosted on services like imageshack or flickr. We store everything in our own database and keep track of our own version of the data, which we stream from the 3taps firehose.