Reconstructing Amelia by Kimberly McCreight
This is Gossip Girl meets murder mystery - after her daughter Amelia dies, Kate tries to uncover the secrets and scandals going on at her daughter's exclusive private school. McCreight did a very good job of using blog entries, text messages, Facebook posts, etc. to show the kids' interactions, but the timeline jumped around a bit too much - there were at least three different periods of time when things were taking place, and the scenes within each of those were presented non-chronologically, so it was something of a chore to keep it all straight. And while this was certainly a page-turner, some of the plot "twists" were very predictable, while others were never sufficiently explained or felt unearned. But the two main characters (mother and daughter) were well-developed, and it was a mostly enjoyable read overall.
(I also have to mention that the book was rife with typos, especially misspellings of a character's name and mistakes with your/you're usage. I do NOT blame the author, but I expect/hope major publishers like HarperCollins use decent copy editors. I know a few things always slip through, but when it's frequent enough that it distracts the reader, it's a problem.)