Two questions: * does the site also allow login by creating a username and password? If so, the social login is just a convenience, and you are probably fine.

Two questions: * does the site also allow login by creating a username and password? If so, the social login is just a convenience, and you are probably fine. If not, you might want to add more (but also consider manual login for the privacy conscious!) * Who is the intended audience, and are there any sites that are particularly relevant to that audience? E.g., GitHub for developers.