On Stack Overflow, greetins, signatures, taglines, etc. are discouraged and are usually removed (edited out) from posts. The main reasons are that they take space and put too much emphasis on the author of the question as opposed to contents. See more details in here: Should 'Hi', 'thanks', taglines, and salutations be removed from posts?.
Is there a policy for that on the Japanese Language site? If not, do we want to follow the same policy as Stack Overflow? Or do we want to make Japanese Language more personal?