Just tell them they'll make easy #money.

I made this post to get everyone to join up to the groundbreaking #LBRY project.

https://steemit.com/lbry/@smurphed/lbry-early-adoption-easy-free-lbc-cryptocurrency

They earn free #LBC coins just for joining, which is just as simple as putting your email address in.

People always need an incentive. Human nature I guess.