Eleven years ago I was working for a large retail department store. I received a telephone call from someone who said there was a bomb in the store, and in which room of the store the bomb was located.
In my long career working in hotel and retail store security departments I had received several bomb threat telephone calls. This call seemed different. Amongst other things we did, the security team and I searched the room mentioned. We found no bomb. The caller rang back 15 minutes later and gave a more specific place to search. Then we found the bomb.
The following day, as part of a complex extortion ploy, the bomber was caught by police. Turns out he was following a scheme he had read about on the Internet describing how to extort money from a large business. So, the bad things which can be found on the Internet are quite really dangerous.
That worries me. Obviously nobody will learn how to carry out a criminal enterprise from this blog. But they are looking.