#_=_ at the end of url after facebook login [duplicate]

_x000D_ _x000D_ _x000D_ This question already has an answer here:_x000D_ _x000D_ _x000D_ Facebook Callback appends '#_=_' to Return URL_x000D_ _x000D_ 21 answers_x000D_ _x000D_ _x000D_ _x000D_ _x000D_ I am using loopback and passport to get facebook authentication for my app. This seems to be working correctly. The user gets redirected to fb for login and then back to my app. However, for some reason there seems to be a #_=_ appended to the url of my app. Any Ideas what could be causing this? This is actually also happening on couchsurfing.com for me. I have tried different browsers and computers.