That's my biggest complaint about the iPad: I can't fully share my ipad with my girlfriend since it is tied to my email accounts, contacts, calendar etc. It makes sense that a phone is tied to one person, but this iOS limitation is annoying -- especially when traveling.
Ah, at least the google toolbar does. If you enable PageRank on the Google Toolbar it sends back all the urls you visit just like the bing toolbar.
From the toolbar privacy policy: "Toolbar's enhanced features, such as PageRank and Sidewiki, operate by sending Google the addresses and other information about sites at the time you visit them."
Google has managed to demonstrate one way MS appears to be using the data. What does google do with their trove of data? That's a lot of data to collect and not do anything with.
If they want to make it perfectly clear they should add into their privacy policies and EULAs.
I seriously doubt that is the only thing they use the information for, and unless someone can find somewhere in the google toolbar/chrome EULAs that specifically asserts what they will/won't do with the data, I'd assume the they use it for all sorts of things.
And while it's telling you the pagerank it's sending your entire browsing history* and then some back to google so the can store it in the google cave.