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The huge spike in voting was due to bots vote spamming. It was prevented with a client update by the witnesses hence the drop off.

Thanks @rainman I will make an EDIT

I think a lot of bots are gone :) I haven't seen a few bots which have vote/comment a lot.

Yeah, the reputation system cleared out all the commenting bots. Voting bots are alive and well, though. Just ask @jl777 - he has a bot that's voting with his main account.

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