Oakleaf, I know there is no drafting advantage to following closely on a climb but there sure is a mental boost and the companionship of shared misery.

Generally, people don't stand in pacelines. Do it at the back.

And if you're climbing closely with someone and need to stand, just call it out beforehand. It's a good idea to be climbing spaced a little bit apart so that the kickback of standing won't cause contact but you can still be close enough to gossip.