Re: Facebook more specific via Level3 ?

looks like this is also affecting other prefixes:

Many of our prefixes are only announced to peers in the metro they originate in. Please stop obsessing about this detail; it's not the problem.

I understand that FB is using some type of DNS geo-loadbalancing and other mechanism to redirect users to (possibly) nearer mirrors.

We target traffic two ways. One is relatively traditional dns global load balancing, using the resolver ip. The other method---which steers the vast majority of our traffic---vends urls that send people to a specific PoP based on their client ip. It appears you're having a targeting problem. Please reach out to our NOC to get support. -- dsp