Get Social Media profiles and contact Information.
Full Contact API is a free Social API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.
Details from docs.fullcontact.com.

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The Full Contact API is provided by FullContact (docs.fullcontact.com).
Yes. The Full Contact API is listed in the Social category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Full Contact API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the Full Contact API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Full Contact API is served over HTTPS, so it's safe to use in production.