I've been hanging out in the main Public Lab chat room for a few weeks now and it's very nice except that plotbot keeps spamming the channel with "looks like nobody's around just now" messages. Examples below from https://gitter.im/publiclab/publiclab?at=5ae228a12d0e228d7bb6fb9d are highlighted in red:

Please note that above I've also highlighted in green a welcome message from plotbot that I think should remain. It's nice to greet new people like this and remind the channel about the code of conduct.