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:r...@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
