In certain online forums, necrobumping may become a prohibited act (and you can get banned) under certain circumstances.
For example:
- when you necrobump many old threads at the same time
- when you necrobump an old thread in order to insult other members
- when you necrobump in order to post a totally irrelevant comment (to the topic of that old thread)
In these online forums there are even rules about that, such as:
"Please refrain from necroing threads. It is highly frowned upon by the community and may be regarded as spam"