"hkn" (who is also a user on Twitter and here) has been ++'ed 4 times and --'ed 0 times by a total of 3 people.
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Operation Sign, User and Reason
++'ed by woremacx
Tweet: @hkn++
++'ed by woremacx
Tweet: ふぉくす子録画みた。 @hkn++ @orzccc++
++'ed by hkn
Tweet: hkn++
++'ed by vjsakura (花火中継を実現したのは、ユースト初かも)
Tweet: hkn++ 花火中継を実現したのは、ユースト初かも