Every now and then, I recognise someone I know on this site who I didn't notice earlier. Unbeknownst to them, I go through their questions/answers (expecting they will be of above-average interest to me) and might up-vote a whole lot of them.
Question: The system has been set up to detect mass down-voting of a user's questions/answers (and the down-votes may be undone). Does a similar thing happen for up-voting?