The offender can write you nasty messages that make people feel themselves unsafe. A man may be hiding somewhere nearby watching your every move, sometimes cybercriminals is your friend, who is hiding behind the mask of anonymity, which he takes from the Internet.
The offender may try to get your physical address. You should know that when you find the IP-address of the person you can determine its location. There are special mobile applications for this function.
Most cybercriminals is the obsessive psychos who like to play with people, make them feel fear. The longer it lasts, the more people can come. Sometimes this persecution may be limited not only online threats, but also a real danger.
On the Internet you can find almost any information about a person, so you should be very careful.