Lately, there's been a trend of users (typically new ones) of placing comments that do not pertain to improving the article on article talk pages.
There's a message at the top of every talk page that clearly states that the talk pages are not to be used for irrelevant comments.
If I see any irrelevant comments on the talk pages, I will rollback/undo your edits or remove the comment. Repeated offenses will result in warnings, and then a temporary ban.
If you're unsure whether a comment is "irrelevant" or not, please contact one of the Acme Heads or Wizards.