Those numbers are guesses and estimates. Here's the graph of uniques that actually comes from reddit's Google Analytics data:

https://www.google.com/adplanner/planning/site_profile?hl=en...

Worth mentioning that is by cookies..

I visit reddit from a desktop, laptop, and smartphone. and probably 2 browsers on the desktop. So that would show me up as 4 entries. I would not be suprised if the average was at 2 cookies per unique-human-visitor.

The table on the left shows a guess that tries to account for that -- it appears the ratio is about 1/6.

I'm confused as to what's being measured in OP's link vs. your links. Is the OP's link measuring number of searches and your trends link measuring the number of daily visitors?

Also, I know the reddit admins have mentioned a number of times that third-party statistics about their visitor count are wildly wrong.