There are some books I read where I wrestle with my conscience: to list it on GoodReads, or not? And so far I've always come down on the side of listing them all, even though they may not all be books I want to cop to reading. I'm listing this one and not putting it in my update feed. Maybe it'll sneak under my Smart Friends' radars, because I read this and I feel a deep shame for that fact. 
 Somehow I've managed to avoid the Clique/Gossip Girl/A-List types, but this series has sucked me in and won't let go. Part of it is that I do have parents at the library who ask if a series is appropriate for their kids of varying ages, and this is one of the books they ask about--because their 9- or 10-year-old daughters watched the first movie and want to read the books, but when does it take that turn for the Older Teen? (Answer: a couple of books ago.) 
 Mia is battling a major depression after breaking up with her boyfriend, and the resulting disinterest in everything makes her whine a lot less about every other aspect of her life. But even without her incessant whining, this drags. We only get through about two weeks of minutiae: who's dating whom, X mad at Y, and lengthy IM sessions with what might be the most annoying Protagonist's Sidekick on the face of the planet. 
 If you've been reading this series all along and have been enjoying it, there's nothing I can say to dissuade you from picking this one up, too. But if you're trying to quit, go for it. At the end of the book, very little has changed in Mia's life. Any major changes hinted at will have to be explored in the next volume, because this one ends just short of where the plot could (but probably won't) get interesting.