If you didn't know yet, a third party Snapchat client, Snap2Chat, has been available in beta for a while via the CrackBerry forums. The developer is continually working to improve it and add new features. It certainly has come along way since the first beta. Bugs have been ironed out, it's runs a lot faster and it has some nice extras. I don't use Snapchat often but Snap2Chat certainly looks like it adds a lot things on top of the official app.
Changelog for v0.8.9
If you're a Snapchat user and want to get a BlackBerry 10 native experience, take a look at Snap2Chat. Remember this is still in beta, if you find any bugs, give feedback to the developer in the Snap2Chat forum thread.