Didn't mind this, although the older character was really shrill and annoying.

Interesting idea, although for a book so centered on technological gadgets, I found it a bit weird that the older version of the character thought to herself 'gee, where can I find a central store of information about people I know... I'll dig up old yearbooks!' Really? the first thought wouldn't be Facebook?

I liked the younger character, although I wished she'd stood up for herself a bit more, and I wish I had a comment for her friends, but we really didn't see enough of them to make a call either way.