Every few weeks I get an email (usually a very unpleasant one) or sometimes even a phone call from a Facebook user who believes that I am "hacking" their internet. They come to this conclusion after they end up on my site after entering www.facebook.com. Looking at my server logs, it seems like this happens to about 1 person per day from different IPs and service providers.
The HOST: header in their request does contain www.facebook.com as I can confirm from my server logs. At this point I believe the problem must lie in DNS. Somehow my IP ends up getting served for a www.facebook.com query. This must happen very infrequently otherwise I'd be seeing a lot more traffic from the problem. In fact, my site would be flattened if even a small fraction of Facebook users ended up there.
Any thoughts on the root cause of this? Anyone seen anything similar? At this point the only course of action I can think of is to create a special landing page for users requesting www.facebook.com from my server telling them to try again later.