[giantrobot]

There was a lot of interesting promise in Web 2.0 that was completely wasted and then died. I think a big part of the problem was even things like Yahoo Pipes were too complicated for a lot of people and anyone trying to use third party APIs for commercial purposes ran afoul of EULAs or just plain old rent seeking. Once privacy invading advertising became the norm APIs were further restricted or discontinued because the user wasn't running a bunch of client side code tracking and scraping all their behavior on a web page.

It didn't help that a lot of Web 2.0 darlings sold out to on-the-way-out Web 1.0 companies \cough\Yahoo\cough\. Yahoo's management couldn't even monetize money, let alone Web 2.0 properties. So instead we got social media silos. You can put stuff in but good luck ever getting it out. You can share it with whomever so long as they also join the same silo.