Obviously this won’t pertain to a few of you…but
Right there is an example of aggregate data that creates your social online profile. That link is pretty much everything about my flickr summed up on an external site. Luckily most of my social info is locked down (for the time being, damn you facebook), but I found this site that’ll grab your info if you search for users. An interesting example since privacy on social sites is a huge topic online right now.