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Kentbrewster has put a series of interesting posts about how to find out if a user on your website has logged into Facebook, Twitter or Google.
Basically, he searches the code to find some specific javascript code, which is loaded only if the user is signed in to the service. Once he finds what he is looking for, he opens the page using a SCRIPT tag. Depending on the availability of the javascript he can determine if the user is signed in or not.
Why is this important?
Because its like releasing an API without knowing about it. You really don’t want people to find out what your users are doing. Do you?
You can find the posts on Facebook, Google and Twitter on his blog.
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