This is cool. I didn't realize this was coming out of the Android camp and into general use.
Web-to-web interactions right now are mostly just copy-paste and saving things to your desktop to upload again. It would be incredibly innovative to share more complex data structures between sites, like events, contacts, videos, etc.
Otherwise, you'd see sharing menus across the web with "Google+, Twitter, etc." on them and no Facebook. Not a position I think they would want to be in.