Any HTC Vive game recommendations? It's for research …

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A person tries the HTC Vive virtual reality experience. (Pau Barrena/Bloomberg News)

I'm interested in writing some things about virtual reality and society (partly about law but not only). I got an HTC Vive setup and am starting to experiment with it. Can any of you recommend any particularly good games or other VR products for the Vive?

I'm particularly interested in products that have a social dimension—likely games, but I'd be happy to see conferencing or socializing software as well, if there is some. I've never played any non-VR multiplayer games, nor much by way of single-player games, so I'll be a total beginner. Thanks!