One of the dreams of Web 2.0 was that website would speak unto website. An "Application Programming Interface" (API) would give programmatic access to structured data, allowing services to seamlessly integrate content from each other. Users would be able to quickly grab data from multiple sources and use them for their own purposes. No registration or API keys, no tedious EULAs or meetings. Just …
I remember that. There were even services built around the idea, like Yahoo Pipes.