"coji" (who is also a user on Twitter) has been ++'ed 4 times and --'ed 0 times by a total of 4 people.
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Operation Sign, User and Reason
++'ed by yoshiori (http://www.nicovideo.jp/tag/EngineerSummit)
Tweet: coji++ http://www.nicovideo.jp/tag/EngineerSummit
++'ed by ssig33
Tweet: coji++
++'ed by snsn9pan
Tweet: coji++
++'ed by yamifuu
Tweet: coji++