If facebook start up a service that offers fast network access to their own stuff, that's fine, it wouldn't break net neutraility rules. If facebook pretend to be an ISP and actively degrade performance from other social networks, then they are breaking the rules.
Spam filtering etc isn't against NN rules. No-one is delivering emails from marketing firms immediately, while holding back your emails from your aunt Mavis for an additional hour because she won't pay the premium service charge, even though they're coming from the same mailserver. All traffic that is getting delivered is being treated the same, as per NN.
CDNs aren't paying for a fast lane, they're paying to be closer to the source of the request. That just makes the hops smaller, it doesn't change the priority of the delivery. If I hand deliver a postcard to you vs putting in the mail 500 miles away, I'm not getting preferential treatment from the postoffice, I'm just closer and hence more able to deliver it faster.
Torrents are all slower than your capacity. That's a neutral network. Now, if some were unthrottled because someone paid off the ISP to do so, that would be against NN.
Spam filtering etc isn't against NN rules. No-one is delivering emails from marketing firms immediately, while holding back your emails from your aunt Mavis for an additional hour because she won't pay the premium service charge, even though they're coming from the same mailserver. All traffic that is getting delivered is being treated the same, as per NN.
CDNs aren't paying for a fast lane, they're paying to be closer to the source of the request. That just makes the hops smaller, it doesn't change the priority of the delivery. If I hand deliver a postcard to you vs putting in the mail 500 miles away, I'm not getting preferential treatment from the postoffice, I'm just closer and hence more able to deliver it faster.
Torrents are all slower than your capacity. That's a neutral network. Now, if some were unthrottled because someone paid off the ISP to do so, that would be against NN.