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CloudFlare has supported a way to purge your cache for the last year. Unfortunately, it was all or nothing. While that, for practical purposes, didn't cause a significant performance hit for most websites.
Sometime on Sunday, November 13, 2011 (which was a pretty awesome day on its own, quite aside from this news) we crossed the point of having saved our users 2 petabytes of bandwidth. That's a staggering amount of data.
We regularly get requests to provide a free paid account in exchange for promoting CloudFlare. I may be naive, but I was surprised to learn how many web companies go along with these arrangements — or even suggest them themselves.
Most people don't think DNS is very sexy, but it's critically important to the functioning of the Internet. At its core, the purpose of DNS is to turn a domain that humans can read (example.com) into an IP address that computers can read (18.104.22.168).