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Fix auth.login bug

After the user logs in, the even auth.login doesn't seem to be
triggered - causing the page not being reloaded.

@see:
https://developers.facebook.com/bugs/524245490930206?browse=search_50f87d9e8869a5e06191882#
Fix undefined variable bug
Change caption for the user's post
Remove colon
Remove Heroku's README