As a new service, I think you'll struggle to attract celebrities and influencers. You'd need to have some really compelling reason for them to use the service,

As a new service, I think you'll struggle to attract celebrities and influencers. You'd need to have some really compelling reason for them to use the service, and the only compelling reason they'd care about is audience size, which you won't have. If I were attempting this, I'd design and aim the network for a niche audience of some sort and once that's established, begin expanding to wider audiences.