Some data matching isn't done with straight cookies. You visited from the same computer, same IP. It may be a guess done by comparing IP + installed fonts. The

Some data matching isn't done with straight cookies. You visited from the same computer, same IP. It may be a guess done by comparing IP + installed fonts. The other possibility is that your multiple email addresses have been matched as the same person. So even though you use different browsers and have different cookies, they're collapsed on Facebook's side.