According to a post that is currently making its way around Facebook, you can check that your Facebook account has not been hacked by entering ‘@[4:0]’ into a comment. The message claims that, if the comment changes to display the name Mark Zuckerberg, it means that ‘your fb hasn’t been hacked’.
https://www.hoax-slayer.net/entering-40-as-a-facebook-comment-displays-mark-zuckerberg/

