[wormseed]

1c/GB is a tenth of the price of datacenter bandwidth, a hundredth of residential DSL or cable access bandwidth and a thousandth the price of mobile bandwidth.

You're off by three orders of magnitude.

[witty_username]

I forgot to clarify I meant DC<->Internet costs. This is the incremental cost of allowing full internet access.

http://www.michaelgeist.ca/2011/04/cost-to-send-a-gb/

[comex]

The purpose of the limitation isn't to save peering costs, it's to ensure users click on Facebook's ads and compensate them for the costs of providing cellular access.