@thomasfuchs can we also talk about the fact, that it does not seem plausibel, that they even have the data to make this claim?
I can't imagine that twitter logs the whole timeline with ordering it shows to users...
@mxk @thomasfuchs ad impressions are measured in great detail, yes.
The reason you need to know which users saw which ads is that advertisers generally don’t want you to see their ad more than twice, it’s called “frequency” in the lingo and is one of the metrics they report.