トースターくらいなら原材料から自分で作れるんじゃね?と思いたった著者の汗と笑いの9カ月!(結末は真面目な文明論です)
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.