Nearly 20% of active Twitter accounts likely to be fake or spam
Oh, do I have notes on their methodology.1) They talk about "active" accounts (meaning have tweeted in the last 9 weeks), and do a bunch of filtering against that. That seems like a huge bias - lurkers exist, and in my experience are usually the majority of users...this step removes them or ignores them entirely. Frankly, until recently, my twitter account would have been one of the ones they would have discarded as inactive. This one thing alone makes me question all of the rest of their results.2) By the same token, the rate or frequency with which a user sends tweets has no relation to whether a user is monetizable. If they're seeing ads, they're monetizable...lurkers are just as monetizable as high-volume posters.