A social media influencer is exactly what it sounds like: someone with significant influence over online followers. 
Some fund managers and entrepreneurs ride the trend of internet and become social media influencers.
Using social media is like using high leverage.
By good use, it multiplies one's influence. 
But if things don't go right, the damage may also grow exponentially.  
Are they doing well? You decide.
@Deezy_McCheezy: Bill Ackman ...