Do you think Snapchat is worth $15 billion? Alibaba seems to thinks so, as do several others. Alibaba alone plans to invest $200 million in the ephemeral messaging app, although it has since evolved into something more, which doesn’t even include the $500 million that Snapchat is raising from other investors. Neither company has confirmed the investment and it isn’t clear why Alibaba is so interested in Snapchat.