You want scary? The same can be applied to general text on the Internet, tying posters on different sotes together, including anonymous (not your real name avatar) to a site with your real name.
Which the NSA probably has churning away on its databases. Which probably does little more than add confirmation of said links from watching and recording all traffic to any and all of a billion IP addresses.
And I, for one, welcome our new panopticon overlords who won't abuse it, not one of their thousand agents, because they're supposed to check a got-a-warrant box on a piece of paper before choosing to abuse it.