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Re:Reddit now tracks all outbound link clicks by default, ex... by beagle3 on Friday July 08, 2016 @03:49AM (#12054105)
> you can still get valid data.

That would be stretching the definition of "valid".

You would get statistics about a group of "I don't care I'm being tracked" people, which is surely statistically different than the group of "I do care about being tracked" people. At the very least, they would have significantly different click rates (and involvement) with the subject like "how to disable web site tracking", but I suspect it's deeper than that -- e.g., they will have statistically significant involvement with security related subjects.

Re:Reddit now tracks all outbound link clicks by default, ex... by andybak on Friday July 08, 2016 @04:50AM (#12054299)
Yep. I would count any 'opt-in' analytics as irretrievably tainted even if by some miracle the sample size made it useful.