Well yeah, it has been a couple of years since then, so that list is bound to be outdated to an extent, but the reason why it was so important wasn't so much because of those guys who've found their sanctuary on known sites like twitter, but rather because it pointed out just where those guys who founded those difficult to find blogs instead have gone...
Also yes, Bobby did have a twitter account (at least at that point of time) where he planned to move all of his stuff from tumblr (i could be wrong though as it WAS a long time ago)... Now bear in mind that was also a couple of years ago, and i haven't exactly checked to see whatever that place even still exists (i was never really a fan of his work) at this point or it isn't a thing anymore (at that point of time Bobby was still a rather well known user over at MA, but after that debacle with the MA staff it is highly possible that he just left mugen creating for good thus terminating his twitter too which would be understandable after all the crap he had been subjected to back then).
As for the other creators a lot of them just stopped doing mugen due to either some life circumstances or due to loss of interest i guess, but i think everyone would agree that everything kinda fell apart precisely because of the death of Tumblr's adult section (not many people could get over the loss of something they've invested so much time and effort into, and understandably so). I think that to date about the only real (sole) survivor of those times (the end times,lol) is really only Grug...
