Maybe you were able to stream music from virtually any performer 10 years ago (probably illegally), [...] - but those things were out of reach for the general public.
That's definitely not true, many of my non-tech friends were using Napster and later Bittorrent. Also, ICQ was popular among the general public in the nineties. Many people were already on social networks, e.g. Hyves had millions of users in The Netherlands.
I think the most radical change the last ten years is that mobile devices have advanced extremely hardware-wise and UI-wise over the last 10 years (initially pushed by Apple). The applications themselves are not so revolutionary.
"Technical innovation" has been redefined to mean a much lower bar of novelty. And business / commercial novelty is not technical novelty, though I realize that may be hard for the ycombinator gang to agree with.
