I have noticed on one meta site a bunch of nice answer badges awarded to the same user more-or-less around the same time. This can be caused by something else, but nevertheless, it made me think whether serial up/down-votes occur at meta sites, too, and whether they are also reversed there. (It is difficult to say, since reputation breakdown is not shown on meta, so I do not know whether some posts of mine have been upvoted and whether upvotes have been reversed.)
Is serial voting detected (and reversed) on per-site-metas, too?