(1) If what he said in the post bar is fabricated and has a bad influence on you, he may be suspected of libel, and he may file a criminal private prosecution with the court for criminal responsibility or claim civil compensation;
(2) Even if what he said is true, it is an invasion of your personal privacy. If negotiation fails, he can sue the court for infringement and ask the court to order him to stop the infringement, apologize and compensate for the losses.
2. "He once asked his former classmates to ask my phone number in an attempt to harass me. Can this prove it is him? " ：
(1) is only circumstantial evidence, and it cannot be directly proved to be him. Only when he directly calls you to harass you and admits that he made the comments on the Internet can he prove that he is himself.
(2) His signature post on the Internet: It can also prove that it is him, which can be used as evidence to ask his classmates for your number.
3, you can sue him, but the key is: first, there must be evidence to prove that online invasion of your privacy or slander your remarks (web content is difficult to collect), and second, there must be evidence to prove that these remarks are made by him.
4. "How to sue him for what reason":
(1) Prosecution: First, find a local notary office to notarize the content of the speech webpage to fix the evidence.
(2) Then negotiate with the website and ask bar owners to delete it. If the website has not been deleted, it belongs to the same infringer. You can sue the website together.
(3) If the website is deleted in time to reduce the impact, he can only be prosecuted.
(4) As for the "reasons" for prosecution, it is either a criminal private prosecution for libel or a civil lawsuit for infringement of privacy.
5. "Going to the Public Security Bureau for security, he violated the provisions of Article 42 of the Regulations on Public Security Administration": if the impact and consequences of the incident are not serious, it is a violation of public security that violates privacy or slanders. You can report the case to the public security bureau and ask it to bear the responsibility of public security;
If it has a serious impact on you, you can sue to solve it; Even if you report the case to the public security and the public security punishes it, it will not affect you to file a civil lawsuit for compensation.
6. When you go to court to sue, the legal fee depends on how much compensation you ask for. If the compensation you require does not exceed 10,000 yuan, the legal fee will be 50 yuan.
If you are still a student, what makes people uncomfortable is not the cost of litigation, but the time: it takes 1 or 2 months for a general case to come to a conclusion.