The last family i lived for a week got internet access from a friend who got those coupons. So, from what i was told, basically people that need to have access to the internet at work get a sort of coupons for some hours of internet usage and there of course there's something like a black market for it. Anyway, i don't think peoplein Cuba miss Facebook. They'd probably be more then happy to have mobile phones in general and a good mobile/GPRS coverage for now. In general, internet is so extremely slow over there that it feels like the whole country is on an analog line from Fidels office.
All residential Internet access in Cuba is illegal (as in is not legally sanctioned by the government) using good old modems, and only a handful of people in very high government positions can have an officially sanctioned house connection. Everyone else is buying it off the black market.
Cellphone coverage is only basic voice and texting without Internet access, and at horribly expensive rates.
This cable was laid between Venezuela and Cuba in 2007. There was an attempt about a couple of years ago to block certain websites here in Venezuela that were deemed dangerous by the government. The reaction from the people over twitter and FB prevented it. I've always been worried that the venezuelan govt will follow the lessons from their cuban and chinese mentors.