I don't agree with the idea that banning ads would lead social media networks to become less addicting, which seems to be taken for granted. If twitter charged $1 a month (which has to be far more than they make from ads served to me), they are still incentivized to keep me on the site. Sure, they might not make marginal dollars from my eyeballs, if I quit then they make nothing. Even if it's a one time purchase, they still want me there to draw my friends there.