By most accounts, Facebook’s IPO should raise $10 billion. What will FBOK do with its part of all that cash? The same thing Google (GOOG) has been doing. Buying up other companies to build up its ecosystem to ensure its longevity as well as assure investors that it is not a one trick pony. Google, several years ago, acquired several companies such as YouTube and DoubleClick and about a hundred…

Facebook Inc.’s cash box is about to get a lot heavier. The social-networking company’s planned initial public offering of shares won’t just create a new stock-market heavyweight. The IPO also will infuse Facebook with as much as $10 billion in cash, creating the fascinating challenge of what to do with all that money. Let’s consider Facebook’s options. The simplest short-term choice is to do nothing. Lots of other successful tech…