Lil devils x said:
Not sure how many of them actually mean it, but I have received numerous death threats. The guy who raped me when I was a kid threatened to kill me, My ex threatened me repeatedly and then tried to kill me twice and went to jail for it twice, I had a customer pull a knife out and threaten to kill me with it when I was bartending in college, I had a guy threaten to kill me when I was working the ER at Parkland, I had a guy threaten me from an MMORPG I used to play, then he sent me a picture of my street sign and was talking about how he gets off watching the life go out of a girls eyes as he chokes them, so I sent him a picture of my Glock 40 with a gutted target and my 15 round clip with a box of hollow points sitting there and he left me alone, (luckily I found out later he actually went to jail too.) Of course there are the numerous death and rape threats while playing PvP games but those I wasn't overly concerned with as these...
People get killed every day for nonsense, so you never know who is and who is not capable and honestly, it is not worth finding out or being wrong to second guess what is going to happen. If your wrong in this situation, you can pay with your life, so it is better to be safe than sorry and call authorities and make sure you take precautions if something like that happens. I am alive today because my neighbor got stabbed to save me. Some people DO mean it.
Blimey! What country do you live in? I think I want avoid going there.
As to the question itself, I think the overwhelming majority are just internet blowhards; the problem is the very small minority that aren't, and telling the difference between the two.
Now that I think about it, I don't think I've ever been actually threatened at all. I've been told to quit playing a game, and to kill myself, but I've never had anyone say they'd find me and kill me. If they did, I think I'd laugh (since I live on the opposite side of the world to most of the people I play against).