On the increased activity front, I kinda like seeing some old faces show up again; people who once were significant contributors of quality/interesting content and then slowly stopped posting, for this reason or that. They will always get an upvote and a welcoming comment from me, and encouragement to "return to the fold" and be part of things for a while, again.

A bunch of serial comment self-voters is a lot less welcome, but they tend to be somewhat minor stake holders who can easily be shown their activities are unwelcome, via a few well-placed flags.