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I've always wondered how promises like this are possible since twitters public API allows only partial access to the stream of tweets?

Twitter offers real-time streams that filter by limited numbers of keywords, userids, and locations.

Yes, this is what I'm using. There are a handful of keywords and users that cover a meaningful range of interesting events.

I have been using this "StreamAPI" for some time now, and I have been suffering of false positives all the time.

How so? I'll probably be testing it soon for a new project.

Sometimes it gives you data that is not relevant to your query.

Example: I want tweets from user: @XYZ You think that you wont need to check, but you'd be wrong.