Googleがほしがるスマート脳のつくり方 / ニューエコノミーを生き抜くために知っておきたい入社試験の回答のコツ

Faceboo auth is required to view user page.

If you have logged in since, it's automatically executed. If first time, Facebook auth login page will be shown, after your authorization, you can access user page.