That depends, on what you mean by that. I mean would you care to explain what you mean by that since it's a rather vague statement there. I mean I don't know if you mean on the boards or the anime hosting portion of the site here.
If you mean for the boards it only means that either a series doesn't suit a person's taste that starts up threads. Although anyone can start up a thread for a series so people can talk about the epsiodes that have been released. Although people tend to go by the info on other sites about a series.
The problem is some people want to even host a pic of the characters in said series so some people tend to shy away from posting up new anime threads of series.