I'm OK with Prismatic using information from twitter and any activity on getprismatic, and but i would not share the rest of my browser usage. For instance there was this day when i was reading up on XML on the browser and opened a bunch of pages on it. Then i fire up getprismatic and lo and behold! i find XML tagged suggestion. That was spooky;)
we don't look at browser history, but we may release a browser plugin for chrome that lets you share, recommend, and save stories from the web to prismatic.