If you are struggling with Facebook Search not Working, then first and foremost, check your internet connection if it's strong or not as a weak connection could be a reason for Facebook search not working. So make sure to get connected to a sound source of the internet. Sometimes, this problem can be solved just by clearing cache files. This issue also arises because of using an outdated version of the browser. Hence ensure that you are using the latest version of the browser to avoid such issues.