Reminds me of Twitter IPO... just wait.
I think this will be worse. Snapchat isn't nearly as culturally sticky as Twitter. Sites like Twitter, Instagram, and Facebook have a robust friend/follower system, and users have a huge backlog of things they contributed to the platforms. No contributions on Snapchat last more than a single day, so what is motivating users to stay on the platform instead of using Facebook or Instagram's offerings? Their friends list…
That said, despite the fact that I love Twitter more than any other network, almost none of my friends use it maybe ~a dozen people I know closely in real life still post to it. Almost all of my friends use Snapchat and complain about my lack of engagement with it.
Anecdotal, but I don't think they are comparable… additionally if your (likely closer nit group of vs. FB's "everyone you know") friends aren't posting, brands are putting up a TON that people seem to really like.