Well I had hybridauth working and login correctly using facebook since 2 weeks ago, I did not any change and this morning I found that it was not working. I tried to switch
It is due to api change of facebook graph api, you can download latest version of Hybridauth for facebook https://github.com/hybridauth/hybridauth, currently third party api is not available for facebook so you need to download facebook sdk and place it under thirdparty directory, you can download it from https://github.com/facebook/php-graph-sdk.
After downloading you may need to configure facebook sdk auto-load files.