No, Your Facebook Account Hasn’t Been Cloned or Hacked
Your likely saw a post on your friends Facebook account over the weekend. Something to the effect that their account had been cloned and do not accept any friend requests from them. Maybe you even posted the warning yourself.
According to Facebook, there has been any increase in account impersonation or cloning. The warning is more a case of people seeing something worrisome and reposting it without checking whether the threat is real. Like fake news.
When it comes to anything you see online, be like Reagan - trust but verify.