Meta Stack OverflowRecent Activity - Responses tab doesn't count comment to @User
[+17] [1] Kobi
[2010-01-18 09:50:25]
[ bug status-completed comments recent-activity responses ]

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(3) More accurately, it does not count @User comments on questions/answers that don't belong to you. I was recently wondering about this in my own tab, glad to have an answer. - Grace Note
[+1] [2010-11-22 03:45:55] Jarrod Dixon [ACCEPTED]

This was fixed with some other bugs [1] on the /users/recent page.