I think it is a best practice to remove a not relevant information from the question like signatures, thank-you's, personal website-url or e-mail or something like that. All that information belongs to the user's profile and could be easily found there if needed.
The content of the question should be clear and understandable from the first look without any "garbage" in it.
Some quotes from the welcome tour to back this up:
With your help, we're working together to build a library of detailed
answers to every question about Salesforce.
Ask questions, get answers, no distractions. This site is all about
getting answers. It's not a discussion forum. There's no chit-chat.
Use edits to fix mistakes, improve formatting, or clarify the meaning of a post.