Examples of using "フェイスブックに追加しておくよ。えっ？なんだって？あっそうか，お前フェイスブックやってないんだもんな。友達いないんだもんな。悪い悪い。" in a sentence and their english translations:
Friend me on Facebook. Huh, what's that? Really, so you don't do Facebook? You must not have any friends. That's terrible.