An estimated 2 billion viewers tuned in to watch Wednesday’s epic, five-hour Sandy-relief concert.

They wasted no time taking to Twitter to voice their views on everything from the lineup of wrinkly rockers, Kanye West’s skirt, the bizarre Nirvana-Paul McCartney coupling, Who frontman Pete Townshend dropping the F-bomb on national TV — and call-center emcee Brian Williams confusing Townshend with Keith Moon.