The reality is that nothing is really dying and nothing is really changing. Twitter is still fully operational and other than a small hit nothing happened. Twitch already did a step back. For Reddit we'll see but only a really small percentage of reddit is using third party apps.

I think the "the internet is dying" perspectives are all incredibly overblown. They aren't going anywhere anytime soon. I remember all of the "Facebook is dead, I don't know anyone using Facebook!" posts, but I suspect many here are invested in some index fund that is being pulled upwards by Meta.

But how many people are still exchanging facebook contacts? Because I haven't met anyone anymore ...

Good point! I suspect it's a lot more than we think. My parents are definitively still involved in doing this.

But on the other hand, does exchanging contacts mean anything to Facebook anymore? I don't think that's important to their income stream anymore. If the OP meant "these sites are still going strong but aren't what they were when they began", then of course I agree.