"yahoo" (who is also a user on Twitter) has been ++'ed 3 times and --'ed 1 times by a total of 4 people.
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Operation Sign, User and Reason
--'ed by tracelog
Tweet: yahoo--
++'ed by video_ (http://event.yahoo.co.jp/invaders/beginning/)
Tweet: yahoo++ http://event.yahoo.co.jp/invaders/beginning/
++'ed by nkoz (おもしろい!)
Tweet: youzaka++ Yahoo++おもしろい!
++'ed by fayaz (Yahoo!!)
Tweet: Yahoo++ Yahoo!!