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The ACM license states

(iii) Post the Accepted Version of the Work on (1) the Author's home page, (2) the Owner's institutional repository, (3) any repository legally mandated by an agency funding the research on which the Work is based, and (4) any non-commercial repository or aggregation that does not duplicate ACM tables of contents, i.e., whose patterns of links do not substantially duplicate an ACM-copyrighted volume or issue. Non-commercial repositories are here understood as repositories owned by non-profit organizations that do not charge a fee for accessing deposited articles and that do not sell advertising or otherwise profit from serving articles.

Does this (somehow) include ResearchGate?

marked as duplicate by Cape Code, user3209815, gman, Brian Borchers, Brian Tompsett - 汤莱恩 Oct 3 '16 at 20:59

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    Which of the four groups do you imagine ResearchGate would come under? – EnergyNumbers Oct 3 '16 at 8:46
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    Maybe (1) the Author's home page or (4) non-commercial repository – David Oct 3 '16 at 8:47
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    Just don't use researchgate. They are spammers, and it's just students there, no experts. Upload it on your homepage / institutional repository, and Google Scholar will find it. You don't need researchgate. – Anony-Mousse Oct 3 '16 at 16:55

No. Researchgate is a for-profit organization that makes money from ads and job adverts. See for instance http://osc.universityofcalifornia.edu/2015/12/a-social-networking-site-is-not-an-open-access-repository/.

Also, if you share your paper there, the Researchgate TOS state that you, not them, have to cover all the legal costs in case they get sued (Article 3, comma 5).

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