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How does Reddit collect data about users?
I'm working on a phone app, where I'd like to have good info about the users so I could give them accurate recommendations without the users having to first type long queries or user profile descriptions.
As I've been using Reddit, I've noticed that of all the possible threads that Reddit could show on the main page, it shows threads that really correspond extremely well with what I might be expected to be interested in. It's obvious that Reddit will probably run all my posts and comments through some algorithms to give me better recommendations, but seems that Reddit knows even more about my interests than that.
Given that I don't have the Reddit app, where does Reddit get this info from? Is there some API with advertisers where you can get info like this also for non advertising purposes, or does Reddit maybe purchase this data from somewhere?
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