In the following video, Motley Fool research analyst Lyons George talks about the investment management company BlackRock (BLK) and its interest in buying $80 million worth of Twitter stock. BlackRock has pegged Twitter to be worth over $9 billion, but since the latter is currently a private company, should we as investors care? Lyons says yes for two reasons: The company is going public, possibly before the end of 2013, and some put the valuation even higher, at $15 billion. He tells us what it is about Twitter that might separate it from its ill-fated social media IPO brethren.