This book is a compendium of those so-called "hacks" they're always click-baiting you with on Facebook. Read the book! Don't click the ambiguous links!
Actually, I learned a lot reading this book. Yes, I knew to use a piece of uncooked spaghetti as a long matchstick. But I didn't know how to make shortcut keystrokes in my iPhone for my email address or my phone number - very helpful when you fill in a lot of online forms.
This is a pick-up-and-put-down kind of book; best to dip in and read a bit, rather than try to read all the way through. But I guarantee there's something here you didn't know - and you'll be simply STUNNED when you discover it.