nl_tokens: Facebook OAuth2 object make various requests the the graphAPI
pl_tokens: <mask> FBOAuth2 ( appId , appSecret , redirectURL ) { this . _appId = appId ; this . _appSecret = appSecret ; this . _redirectURL = redirectURL ; this . _authURL = 'https://www.facebook.com/dialog/oauth' ; this . _graphAPIURL = 'https://graph.facebook.com' ; this . _accessTokenURI = '/oauth/access_token' ; this . _profileURI = '/me' ; }