Looking at flickr, the only thing i have to say about Yahoo buying Tumblr is:
One day, two thousand years from now, a much more advanced human civilization will uncover an artifact of our time: a Hard Disk Drive, a functional HDD among thousand others that formed some form of data cluster.
Within it, the only relic of this ancient civilization: fanfiction.net. It will be heralded as a glimpse into the story and culture of people long lost in time, rich, colorful, even if confusing. Thousands will devote their lives to study and understand those who followed the word of the mighty hero: John Stalvern.