There are a few reasons why MetaTalk threads are closed. The main reason is for threads with very specific requests -- typo fixes, double post deletions -- that don't require additional discussion once the problem is solved. These can often be resolved more simply with an email or IM to an admin. Sometimes a thread duplicates an existing open MetaTalk thread, devolves into noise and/or a trainwreck, or was a joke thread to begin with. MeTa posts that are just updates from closed posts on MetaFilter are often closed with the suggestion to make a new post if the update is a big deal, but not use MetaTalk as a place for posts that aren't right for MetaFilter.