Replying to @swodinsky and @scriban2, @NSQE, @daphnehk, @CaseyNewton, @Klonick, @WillOremus, @mmasnick
I don't think that you can separate the two clauses here. It *serves* as a way for users to interact with UGC *and* to deliver ads to users. If you consider the conjunction is makes more sense.
(Yes, I've become used to finding meaning in poorly written legalese.)
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