Remember late last year when Google offered $5.3 billion to buy out Groupon? When the daily deals site rejected the generous offer from the search giant in favor of pursuing an IPO, it unleashed a flood of commentary, from this site and others. Many were skeptical; I wrote a blog post for HBR in the aftermath of the decision questioning the business stability of Groupon’s model. Others contended that the deals site — at one time speculated to be valued at $15-20 billion — had nowhere to go but up.