For about 4 hours now Facebook's servers have been hitting my site every 5 mins at the start, but now at least once per minute.
Getting this in logs
66.220.153.246 - - [25/Apr/2012:20:08:49 +0000] "GET / HTTP/1.1" 200 7304 "-" "facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)"
Anybody have any idea why they would be doing this?