It was a Japanese cell phone game from what I recall. Let see. They (the game company) were asking on Japan's Twitter what females where the people favorites 3 females; they were Kushina, Sakura,and Temari. Then suddenly hinata took first place I believe people look at the people that voted for her, and noticed it was a lot of accounts that voted for her were new. So the Japanese fanbase took to calling them "Hinata's eggs." It was a minor event from what I recall but it caused enough of an uproar for people to hear about. It happen in Japan and within the Japanese fanbase, so it likely it was the Japanese Hinata fans. If it was somehow the western fans that somehow heard of it...well, that's even more creepy.
I see. Then it might be either the Japanese fanbase or the Western fanbase or any single/few persons can do that.