He always talks about it using blockchain but I haven't seen him get more specific.     

Thank you all. You have given me plenty to think about. Sorry about 2.4 typo.   

I want to give the smallest practical amount of BTC to friends and family to introduce them to it.
What is the best way to do this?
What are the smallest amounts that can be sensibly transferred?
Thank you.

If BTC really dominates our world, will 2.4  quadrillion satoshis be enough for the blockchain functionality to run other applications ?   What will happen when limit approaches?

Question is really can you pay or receive a fraction of a satoshi?