There's more to it than just that Facebook themselves occasionally fit the profile of a spammer, and so some of the more stringent networks may filter mail from them. Facebook is a major source of drive-by malware, and some of the apps on Facebook tread close to the spyware/adware/parasite line and so other security tools/IP reputation services, depending on how they implement the blocks for the droppers, and other undesirables, may actually filter all traffic to/from the FB servers, as opposed to the dropper redirect or app/adware host. Regardless, for some subset of the world, reachability to various social networking sites is becoming less reliable.
-----Original Message----- From: Rich Kulawiec [mailto:rsk@gsp.org] Sent: Friday, February 26, 2010 7:15 PM To: nanog@nanog.org Subject: Re: Spamcop Blocks Facebook?
[ This discussion really should be on spam-l, not nanog. ]
I'm not affiliated with Spamcop, however, it's well-known among those of us who work in this area that (a) Facebook has been spamming for quite some time and (b) they're not the only "social network" that's doing so. So it's not especially surprising that one or more DNSBLs/RHSBLs is/are listing them: they've earned it.
Point of order, however: Spamcop blocks nothing. Mail system administrators who choose to use their resources may block or score or tag or ignore at their discretion.
---Rsk