highlight the web

There’ve been plenty of services that overlay notes of some kind on the web, or share clippings, or build a stream of them, etc.. but they all require some tool beyond the web to both produce and consume such highlights.

What if highlighting were built into the web? My highlight stream could be a data asset, e.g.:
- to google as an input to ad-targeting
- to amazon as input for book suggestions (exceedingly useful there)
- to the same people who might subscribe to one of my tumblogs
- …

Just a thought.