Dealing with user pages and talk pages
Talk pages and user pages
They BELONG to the user and not to others. You can write on the talk page of others, but it doesn't mean this is now your page and you can do with it what you want. After you added something there, leave it there and let the other user decide what to do with it, whether or when to delete it or leave it.
It means: Don't post messages on talk pages of other users that you may want to delete minutes later...