The problem is, a lot of the time I don't want my various internet IDs linked together - I want something more like the coffee club loyalty card for each websit

The problem is, a lot of the time I don't want my various internet IDs linked together - I want something more like the coffee club loyalty card for each website I visit. I definitely don't want facebook knowing which sites I use (frankly I don't trust them enough) and I'm not too keen on Google knowing either. The crucial difference between a drivers license and some kind of centralised internet ID is that anyone can verify a drivers licence with a reasonable degree of accuracy - they don't need to contact the government each time to see if it's genuine. With an internet ID the provider gets to collect a lot of information about me and what I'm doing (not saying they would, just saying they could), which makes me nervous.