All STEEM users - please check - are you upvoted this 
I definitely do not upvoted or ever visited/read this topic, but found my vote on blockchain.
This occured immediately after posting my first comment today on Steemit.com
As you can see, this post gathers new upvotes every minute:
I suppose all this upvotes are auto-generated through steemit.com site vulnerability. In addition, I suppose all this voters were compromised, at least their posting WIF keys and [possible] owner keys.