I’m confused

what is tremor media?

A Ghostery popup at a website I frequent showed a tracker new to that site, Tremor Media, as unblocked. I had not white listed the site's domain so I don't know why. I tried the "What is . . ." link but got a 404 time-out. Anyway, I set Ghostery to block Tremor Media and that stuck, but why would a new tracker be unblocked to begin with and what's with the what-is time-out?
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