FB may be getting slaughtered by the media, hated by both the left and the right, but the truth is no one is actually leaving FB. It's still the #1 place to find restaurants, buy/sell used items, neighborhood groups, etc etc etc. And if FB Proper were to ever fall behind, IG still has a lot of stamina left.
I don't think it will happen any time soon, but I would like to see Apple decline. Their ideals and design and software quality from the previous decades are nowhere to be seen. Their software and UX especially have suffered from mismanagement, and I wonder how bad it will need to get before people start switching away. The alternatives are still behind, but the gap is closing in a bad way.