Developers have. But unfortunately, most that the users (aka our customers) want is a place where they can share cat videos, have instant communication with friends and (distant) relatives and, depending on allegiance, Trump or Clinton memes in peace. There are only two things that can not be done on the social networks: gambling and porn. Everything other has been slowly absorbed, especially by Facebook.

Also: when you're working 10+ hours a day or more, you most often don't have time to maintain your own blog, much less a full blown web server. There's the reason why Instagram, FB and Twitter are so damn successful: they're essentially frictionless after the sign-up process.