I don't think it's a matter of adding a smiley at the end of each comment (although I love smileys, so I do that too :-) I think it's more a matter of saying "

I don't think it's a matter of adding a smiley at the end of each comment (although I love smileys, so I do that too :-) I think it's more a matter of saying "Yes, good job on figuring out how to do p + kv recursively! Here are links to {papers|books|lectures|other code} that go further if you want to explore this topic more" rather than saying "Oh, you figured out how to do p + kv recursively, just like millions of other CS freshman. Good for you". It's the little details that make online communities pleasant :)