And you need to pay 185 kUSD and a long and expensive approval process.
I think the big difference is that not anyone can register a gTLD in the same way that you register a .com or .whatever. Also, new rules apply to the registries, so if you are doing "bad" stuff ICANN can remove your registry and bye bye.
Another reason to stay away from clicking anything inside Facebook. Once I though they were amazing, now sadly I can see that as many other companies it is just money, no matter how.
they have to do it sooner or later, the sooner the better.
it would be an example to other people here deploying their websites (may be this is to late to little but some people really would follow their example)
because it is the right think to do.
because contrary to css vs tables, ipv6 is not backward compatible with ipv4.
and because i could add their website to my experiment, but that it is more in my benefit than in theirs =).