It's happened with a few of their blogs for me. I know one is their Aston Villa soccer blog http://www.7500toholte.com. It's happened with a few of their college football blogs too (http://www.sippinonpurple.com, for example). It doesn't always happen, but I've seen the Malwarebytes IP Block window come up 5-10 times when visiting SBNation sites, and it's always the 184.108.40.206 IP being blocked. That said, I've had this IP blocked when going to other sites as well, so perhaps this is a problem on my end with some malware remnant that I need to take care of and not an issue on their end.