After trying Spokeo and being surprised how many sites allowed users to be searched for by email address, then reading the reactions of people who'd been sent emails by Spokeo telling them that their accounts had been identified, I decided to make a site that not only would allow anyone to find which of their accounts were identifiable by email address, but would also provide details of how to switch on privacy settings that would prevent this from happening.
Given an email address, IdentiFight searches as many sites as possible and finds accounts that are linked to that email address. It then presents a bit of information about each account, plus details for how to change the privacy settings for each site. There are also links to each site's privacy statement.