Kim Kardashian, Leonardo DiCaprio and a bunch of other celebs are banning together to make Facebook stop and listen ... by putting its biggest attraction on ice for a bit. A massive amount of stars are participating in a 24-hour Instagram freeze Wednesday in partnership with Stop Hate for Profit ... which is leading the charge. It's a pretty simple idea ... a one-day moratorium on posting ANYTHING on Instagram, to stick it to Mark Zuckerberg and co.