That's not how it works at all. You cannot make credible claims on camera, in public, that you committed multiple felonies and then prevent the police from using said video as a basis of a search warrant by simply saying "lmao jk bro."
I challenge you to try it, go post on Xitter something like "I planted a bomb in the cafeteria of [local elementary school], I will actively monitor activity at the school and trigger the bomb when I believe it will cause the most casualties. As proof, here are timestamped pictures of me assembling the bomb. Lol jk tho, is all a joke, lmao." Your house will be torn apart by locals, staties, and feds while you sit in a holding cell waiting for everyone to realize the inherent genius of your "joke."