maybe not "afraid" but...
I'm not that sure German mature audience interviewed is completely wrong, since also if not necessary scary, a "tool" that kids and teens simply define "fun" should not interest so much adult audience, at least not automatically or as a measure of nothing particularly interesting. I prefere to consider a lot of other Web based opportunities to be lost by an entire generation as a potential risk, mostly a cultural one, but when the social network bubble will blow maybe we'll be able to consider more carefully that the Web is social since the first hyperlink has been created, and that, as a my humble contribution, social bookmarking was already there before facebook and, lucky us, will surely survive it. So, maybe, mature germans are just waiting for a better scenario and that the public discussion regarding the biggest cultural revolution since Gutenberg move from what we "like" and where we spend the night to something more interesting...