(Depending on whether you are PC or console, some of these might also help)
-Update your version of adobe flash.
-Uninstall your battlelog plugin in your Windows Control Panel and then download updated version from battlelog webpage. Then clear your internet cache, close your browser. Finally, reopen your browser and return to battlelog webpage and try to join a server.
-Make sure that you reset your server search settings to default and see if any servers show.
-Try a different webbrowser such as Firefox or Maxthon.
If any of this helps mark as solved and add an XP 🙂