There are tons of apps out there designed to work with your Facebook account, but you've got to be careful which ones you use, because some are more dangerous than others. Just take a look this "unfriend" app. It can steal your Facebook password and do other damage to your smartphone or tablet.
The app is called Unfriend Alert, and it's designed to let you know when a Facebook friend unfriends you. But, instead of sending your email and password right to Facebook when you log in, it sends them to its own domain.
“Looking at a Wireshark log for this check however shows that the login credentials are not sent directly to Facebook but to yougotunfriended.com,” security firm MalwareBytes said.
That's not all. The app can also infect your gadgets with harmful malware.