Some people are very much interested in joining with facebook applications due to their friends request, curiosity, making money and some other reasons. But we must be very careful while joining with a new facebook application. Some fb applications are very dangerous and the owner have the ability to hack our account and information, so we must give our concentration while joining with a new fb application.
As we know some people having fake profiles in fb and it is very hard to believe a person using their profile and information, as we have the ability to create multiple accounts in fb. Some people take advantages in it and creating multiple accounts and fake profiles and create some dangerous application with facebook. We must avoid joining with unknown and strange applications in fb.
As facebook don't force anyone to join with certain application and it is our own wish to join with an application or not. Some people creating a fake mail notification like fb and force users to join with their application. Don't believe this kind of fake notifications and join with this kind of application. Always make a search about the application and read the reviews before joining with a new group or application in fb, it is your safer side.
Accept the new friend request in facebook after checking the profile, don't accept friend and application requests blindly. If you shared your personal information in your fb profile, better to keep it in private manner and don't share your details in public manner. Most of the fb applications have the ability to access our account after joining with it. Always facebook give the notification and ask our permission before joining with a new application. If you suspect an application, don't join with it as well as don't give permission to it to access your account.
Some people sharing most of their life events, information as well as personal details in facebook and using this site as their diary. Surely this kind of persons must be very careful while dealing with this kind of unknown applications. Better to avoid joining with unknown applications if you shared most of your details in your facebook account