> 2. There's a universal tendency for people to reminisce fondly about the good old days and contrast them with the ostensibly bad present. It has nothing to do with the truth. It is simply a syndrome of getting old. People were doing it 3000 years ago.
I'm afraid that whilst there's some truth in what you've said, I think you're far wide of the mark here.
It's not about getting old. It's about the fact that, and I wouldn't pretend to understand the mechanics here, for whatever reason when too many people get involved in something it changes. It might get better, or it might get worse, or it might get better and then get worse, or whatever.
In this case I think the point that twitter, or whatever, somehow gets "spoiled" is perhaps valid. I would argue I've seen a similar thing with facebook. It used to be people posting updates about themselves and was a good way to keep up with people; now it's largely people sharing pre-created content - 10th rate jokes and memes, political petitions, news - real or otherwise - from a parasitic ecosystem of sites predicated upon social sharing.
That spoiling can manifest itself in a variety of ways, and can take either a short or a long time to happen. The point is that a large influx of newcomers into an existing community, business, special interest group, or whatever, can radically alter the dynamics of that group in a way that is unpredictable, and sometimes not good.
And I apologise for the slightly rambling nature of this comment - haven't had time to edit it into shape.