Facebook Connect allows users to bring their Facebook identity and social data to other sites. Comment on Change uses this system to let people leave comments using their Facebook account. This screenshot shows a user signed in with both Google and Facebook accounts.
People leave comments with their Facebook identity. In this case, a stranger's comment appears with the name and picture retrieved from Facebook.
The social data from Facebook can be used to find friend relationships between users. Here, the user's own comment appears in a blue highlight, and a friend's comment appears in a green highlight. This was done as a proof-of-concept for using the social data.
The main page links to the pages (and paragraphs) in its list of recent comments.
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