Is Stumble upon a possible new ping-able service?

I just figured while we are updating blogs, why not Stumble as well. I use that service so much but do very little actual socializing there, and Ping could help with that?

As an aside: I was also wondering how many services you were planning on adding? More specifically, will you ever be considering smaller social networks and blogs that ping visitors could choose to add and ping besides the sites that already have millions of users? Or do you think you'll leave it up to the smaller "networks" to implement the API themselves?

Thanks. I'm new to ping and very excited it about it. Great job.