You most likely have a rogue app on your account, but it is possible you have picked up a malware on your computer.
TO REMOVE APPLICATIONS:
https://www.facebook.com/help/170585223002660/
For malware on your computer try running a FULL scan with your antivirus program. Antivirus programs don't always look for browser add-ons (extensions, toolbars)--so you will want to check your browser add-ons for anything that seems suspicious and disable it and see if that resolves your issue:
BROWSER/DISABLE ADD-ON TECHNIQUE
IE 7: Open browser. Click "Tools", click "manage add-ons", click "Enable or Disable Add-ons", in the "Show" list click "Add-ons currently loaded in Internet Explorer", click the add-on you want to disable and under "Settings" click "Disable".
IE 8: Open browser. Click "Tools", click "manage add-ons", under "Show" click "All add-ons", click add-on you want to disable, then click "Disable".
IE 9: Open browser. On browser toolbar click the little gear icon, click 'Manage add-ons', in the 'Show:' box change to 'All add-ons', click suspicious add-on to highlight and select 'Disable' in the lower right of window.
GOOGLE CHROME: Open browser. Click customize(wrench) > Tools > extensions > disable add-on desired.
FIREFOX: Open browser. Click menu > Tools > Add-ons > disable add-on desired.
SAFARI 2.x: From Safari menu select 'Preferences', click the 'Security' tab, uncheck 'Enable Plug-ins', click OK, close and relaunch your Internet browser.
SAFARI 3.x: Click the Safari menu, select 'Preferences', select 'Security' tab, remove check from 'Enable Plug-ins'.
---------------NOTE-----------NOTE--------------NOTE--------------------
NOTE: The program files for the add-ons are not deleted by the above. They can be re-enabled. To permanently remove the program files on PCs: Start > Control Panel > Add/Remove Programs (on Windows 7 operating system this is 'Programs and Features' folder) > select program and click delete. You will need to restart your computer.
MACs: I am not familiar with how to remove programs from MACs.
It is a good idea to clear your browser history, temporary internet files and cookies also (Start > Control Panel > Internet Options) OR (You can get to Internet Options from the Tools menu on your browser).
TO REMOVE APPLICATIONS:
https://www.facebook.com/help/170585223002660/
For malware on your computer try running a FULL scan with your antivirus program. Antivirus programs don't always look for browser add-ons (extensions, toolbars)--so you will want to check your browser add-ons for anything that seems suspicious and disable it and see if that resolves your issue:
BROWSER/DISABLE ADD-ON TECHNIQUE
IE 7: Open browser. Click "Tools", click "manage add-ons", click "Enable or Disable Add-ons", in the "Show" list click "Add-ons currently loaded in Internet Explorer", click the add-on you want to disable and under "Settings" click "Disable".
IE 8: Open browser. Click "Tools", click "manage add-ons", under "Show" click "All add-ons", click add-on you want to disable, then click "Disable".
IE 9: Open browser. On browser toolbar click the little gear icon, click 'Manage add-ons', in the 'Show:' box change to 'All add-ons', click suspicious add-on to highlight and select 'Disable' in the lower right of window.
GOOGLE CHROME: Open browser. Click customize(wrench) > Tools > extensions > disable add-on desired.
FIREFOX: Open browser. Click menu > Tools > Add-ons > disable add-on desired.
SAFARI 2.x: From Safari menu select 'Preferences', click the 'Security' tab, uncheck 'Enable Plug-ins', click OK, close and relaunch your Internet browser.
SAFARI 3.x: Click the Safari menu, select 'Preferences', select 'Security' tab, remove check from 'Enable Plug-ins'.
---------------NOTE-----------NOTE--------------NOTE--------------------
NOTE: The program files for the add-ons are not deleted by the above. They can be re-enabled. To permanently remove the program files on PCs: Start > Control Panel > Add/Remove Programs (on Windows 7 operating system this is 'Programs and Features' folder) > select program and click delete. You will need to restart your computer.
MACs: I am not familiar with how to remove programs from MACs.
It is a good idea to clear your browser history, temporary internet files and cookies also (Start > Control Panel > Internet Options) OR (You can get to Internet Options from the Tools menu on your browser).
