Nowadays a lot of websites (for instance CNET.COM and some forums) offer to login using your Google (Facebook, Yahoo etc) account instead of creating account on the website.
Can anyone explain what the implications of this are (let's talk about Google for the sake of clarity)?
The questions would be:
- What information does Google share with the website?
- If I use the same Google account to login to different websites - does website A know I use the same Google account to login to sites B, C, D?
- If I no longer want to use Google account to login to particular website - can I change my email to something else (other Google or non-google email) and still be associated with all the postings I made on particular forum?
It just seems to me that even though using Google account to sign in to third-party sites seems convenient initially it can cause a lot of headache in the future.