There are many features of Facebook which are unknown to many people but they are very interesting and helpful, few of them are:
1) When some unknown persons send you messages then these messages are saved in a special inbox which many people don’t know about. All these messages can be seen by click on your message icon then see there will be written ‘Message Requests’, click on it to see those messages.
2) Go into your account settings and click on security, there will be an option ‘Where You logged in’, here you can see from where your account was used, if you found any suspicious activity then click on ‘End Activity’.
3) You can change the Facebook language into pirate language or can turn it upside down. Just go in to setting and click language. In the language bar you will have the option of ‘English Pirate’ or ‘upside down’.