is there a social website/ app messanger that cops cant backtrace?

[Stefan]

i really need a webstie or a messaging thing, app or anything, anything where you can communicate and send pictures to eachother, which cops cannot backtrace if you are locked out of it or something like that.

there has been some pictures going around, and i might be questioned about it.

I need to make a story that someone sent it to me through a social website / app / messenger, and that i lost the account pass and or name, and it needs to be untracable. please help asap