Much as I LOVE bookstores and real printed books, sometimes I wonder if we’re destined to source everything on our lit up screens. I sure hope not, but Kindles and all that notwithstanding, there is so much more info/free info online these days. Today I want to let you know about the definitive guidebooks for both FACEBOOK and TWITTER on mashable.com. Check them out for yourself; they’re like big presents wrapped up in a bow. Sure, they may need an update based on the brand new Facebook redesign, but for the most part, they’re practically encyclopedic in their capacity for anyone who wants to leverage the power of these platforms. These are the quintessential guidebooks, and how often does one get to use the word quintessential?! Caution: you might be there for a while.