Facebook does exactly this. connect.facebook.net is a CNAME record to 'connect.facebook.net.edgekey.net' which is, of course, Akamai. Akamai is essentially doi

Facebook does exactly this. connect.facebook.net is a CNAME record to 'connect.facebook.net.edgekey.net' which is, of course, Akamai. Akamai is essentially doing what you describe CloudFront handling, except at a much larger scale and with an existing wide deployment into Facebook's infrastructure (all of their photos/videos are served by Akamai CDN, for example).