Definitely the best influencer would be the one and only Andreas Antonopoulos. Check out his YouTube channel[1]. Link below.

Though if the main reason you're looking for influencers is for you to decide on what ICOs to invest on based on your opinion, then that's definitely a bad idea. Want to invest in ICOs? Do your own research and then decide for yourself.

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[1] https://www.youtube.com/channel/UCJWCJCWOxBYSi5DhCieLOLQ