From long time a hoax is coming on Facebook that typing @[4:0] in any of the Facebook comments box will make it as “Mark Zuckeberg”
Below is the @[4:0] Circulating Message
Go onto a photo on Facebook and type in the comments @[4:0]. If it changes to Mark Zuckerberg it means your fb hasnt been hacked. Mark Zuckerberg is the creator of fb.
But this is not working now, it used to work earlier because Mark Zuckeberg Facebook id is 4.