Mashtalk

Snap is starting the year off strong. Its quarterly earnings blew past expectations, and while its redesign is angering some users, the change is expected to improve the app experience for everyone, with time.   But life hasn't always been so great for Snapchat. CEO Evan Spiegel continues to be compared to Mark Zuckerberg and his tech giant Facebook, whose much larger products keep taking on Snapchat-esque features. Such a comparison isn't so crazy. Back in 2013, Facebook offered $1 billion to acquire Snapchat. Zuckerberg later upped the offer to $3 billion. And that's just one drama in a long saga of how Snapchat and Spiegel rose to fame.   For more details on the rise of Snapchat, we spoke with the guy who wrote the book — seriously — on this week's MashTalk. Billy Gallagher is the author of "How To Turn Down A Billion Dollars: The Snapchat Story," which is out Feb. 13 and available on Amazon.   Gallagher has quite the personal knowledge of the whole "Snapchat Story." He attended