As a 24-year-old in Tumblr’s main demographic, I am all too familiar with Yahoo and was in my early teens during it’s heyday. But even a 12-year-old will know Yahoo as the e-mail provider grandma uses to send out too many forwards of cats, in the same way they know she won’t upgrade from IE to Chrome and still has a VCR. Personally this acquisition both disappoints and ceases to surprise me. Fandoms have had forums, greatestjournal/livejournal, tumblr… one hub will always have to give way to the next. This won’t be “the end of tumblr” until the day a shinier new option comes around.