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Not sure what tools they have to follow this, but please notice this:

"Please be reminded that each user can only vote once per project PER DAY. Any vote that does not comply with this rule will be removed from the count. Netcoins is in the process of removing invalid votes, so please note that the number of votes you see for each project below may not reflect the real number or final count."

I'm always a bit paranoid about technology and I have voted only with one email address, as in the worst case scenario they'll somehow find out and remove some of the votes, which would make Steem to lose. The worst part in this would be if someone would not vote because they think Steem is past safe level.

Also from different IP addresses?

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