public async Task <string> RegisterFB(string user, string fbId, string email)
        {
            AWSOAuth awsOAuth = AWSOAuth.GetAWSOAuth();
            // string s = await awsOAuth.RegisterFB(userid, fbId, email);
            string err = await Signup(awsOAuth.GetUserFB(user), email, awsOAuth.GetPwdFB(fbId));

            if (err != null && err.Contains("ser already exists"))
            {
                return(await Login(awsOAuth.GetUserFB(user), awsOAuth.GetPwdFB(fbId)));
            }
            return(err);
        }
        public async Task <string> LoginFB(string username, string fbId)
        {
            AWSOAuth awsOAuth = AWSOAuth.GetAWSOAuth();

            return(await Login(awsOAuth.GetUserFB(username), awsOAuth.GetPwdFB(fbId)));
        }