I concur - Facebook's plugins to every damn website means that they can tell where your IP address is visiting and correlate a "profile" over time based on the sites you visit. So while they may not know your name, they can tell (as long as it's a property they have a partnership with) where you've been. Site owners that care about privacy should reject all the social plugins that also do this. So if there's a Facebook Like button, or a Facebook comment system on the page, whether you utilize them or not, their plugin was called in order to load it and in turn, you've been tracked.