Lightning penetration in a friend list of 500

I posted on my facebook (friends only) to test lightning international transfer by sending friends 100-1000 sats for fun. (Note that 80% of my friends are Vietnamese - supposedly high bitcoin adoption country)

I gave a bit of guidance: get Bluewallet app, add lightning wallet, press receive and send me the invoice in the comment.

I have no taker as of now ???? Lightning is wonderful, I wonder why so few people know about it.

How many of your friends do you think would comeback with a valid lightning address if you were to give them light instructions and send them some sats?