A friend of mine upvoted all of my StackOverflow posts daily for a period of time until it got flagged and the points were removed. He did it again later, and i

A friend of mine upvoted all of my StackOverflow posts daily for a period of time until it got flagged and the points were removed. He did it again later, and it got flagged again with a warning. I had to ask him to stop upvoting all my posts, because it was indistinguishable from me giving myself points via a proxy account.