Some people think all Internet traffic should be treated equally. Others have no problem propping up certain services. To no one's real surprise, cellular carriers are increasingly in the latter camp. On Wednesday, Sprint’s prepaid Virgin Mobile division announced a dirt cheap prepaid plan that lets customers pay a paltry $5 for uncapped usage of Facebook or other social networks, instead of a broader and pricier data plan.See also: Why Net Neutrality Became A Thing For The Internet GenerationThis follows similar announcements by T-Mobile, which offers unlimited music streaming from Pandora, Spotify and other apps, and AT&T, the first carrier to launch a "sponsored data" scheme that lets favored apps or services pay for their users' data costs.