21st Century Canasta by Mark Elsdon

A participant takes a borrowed deck and shuffles it. You never touch it. Ever. They turn over the top card - it is the Jack of Clubs. Your phone has been on the table the whole time and you tell the participant to open the Facebook app on your home screen. The most recent item on your feed is from a few minutes earlier: it is a photo of you holding a playing card - it is the Jack of Clubs. Boom! Thanks Chan!! 

And it DOESN'T have to be a photo, it can be just a regular status update: "Someone is about to pick the Jack of Clubs. Who knew? I DID!" or whatever damn thing you want it to say. And yes, they could check it on their own phone too.

No special app required.
No assistant required, this is an entirely self-contained method.
No sleight-of-hand required because you NEVER touch the deck!
Any deck, no dupes, no preparation.
No stooges, instant or otherwise.
No dual reality.
No fiddling with your phone - it is on the table from the start and THEY check the prediction. You NEVER touch the phone!
Nothing extra to buy or learn.
You're a mentalist and don't use cards? Prefer to use star signs? No problem.
I know, right?