1. It could be gamed, and still can (check fiverr gigs here
) - thats not very authentic.
2. The algorithm
itself measures over 400 criteria and other web content, but it can't measure emotion felt towards someone on - this could be a one off post.
3. The most influential person is Barack Obama and Justin Bieber. This is always going to be different if you asked social media users who the person was that influenced them the most, you'd get some very interesting responses and they would be different depending on age, location and what they use social for.
4. Does the score measure things like the content quality thats being shared, production value of youtube channel, media value of audience or and this is a key factor, "shared first syndrome". Those people that are the people that share the next viral piece of content early. They could be seen as influencers when they are not creating content.