I don't think this is clear. WHO folks made this claim to us in a briefing and, somewhat stunned at the contradiction with existing studies, we persistently asked for the underlying data/studies for clarity. Did not get a response. At this point, I don't know what they mean.
Hey, I already opted-out of your service! Why are you still compiling my tweets? Please take all my tweets of your service as your opt-out suggests is what you do.