MC recently confirmed nofollow links do not pass PR, do not pass trust, do not pass anchor text, they are useless.
Googlebot follows them and your link graph includes them even if they provide no "pagerank". Hardly useless.
I once worked on a fan site for an amazing band called Tyr and its frontman Heri Joensen and without social the results would have been negligible. For some topics social is a must, people can't look for what they don't even know they like yet and who looks for the words "tyr" or "Heri" anyway? Nobody without social driving people to want to know more, that's who.