better not to use the Facebook because they have got all the information like our personal information, phone number,Photos, who are the people we are connecting with, who are we most chatting, mainly our current location ..etc here is the post which i made a deep detail about the facebook third party - https://steemit.com/technology/@troubleshootp/read-this-before-giving-access-to-third-party-apps-to-your-facebook-profile