1) Facebook – https://developers.facebook.com/apps – more details on https://smashballoon.com/custom-facebook-feed/access-token/
2) Twitter – https://apps.twitter.com/ – more details on https://themepacific.com/how-to-generate-api-key-consumer-token-access-key-for-twitter-oauth/994/
To get your Facebook page ID, you can get it from the http://findmyfbid.com/
