Facebook's 50 million accounts were recently hacked. In response to this Facebook has mentioned that it has found no evidence regarding the fact that any kind of hackers have actually accessed third-party apps.
Also the bigger worry is that apart from getting access to Facebook's accounts hackers have also tried to hack all the accounts related to the Facebook account.
It is further added by Facebook that thy are in the process of analysing the logs for all the third-party apps installed and logged during the attack last week. Also seeing the current hacking, it basically highlights how serious the consequences can get.
Till date, Facebook login was used as an invaluable tool for developers. Now developers seem to be impacted by this hack.