static FacebookProvider()
{
supportedClaimTypes.Add("id", ClaimTypes.NameIdentifier);
supportedClaimTypes.Add("name", ClaimTypes.Name);
supportedClaimTypes.Add("first_name", ClaimTypes.GivenName);
supportedClaimTypes.Add("last_name", ClaimTypes.Surname);
supportedClaimTypes.Add("gender", ClaimTypes.Gender);
supportedClaimTypes.Add("link", ClaimTypes.Webpage);
supportedClaimTypes.Add("birthday", ClaimTypes.DateOfBirth);
supportedClaimTypes.Add("locale", ClaimTypes.Locality);
supportedClaimTypes.Add("email", ClaimTypes.Email);
}