I'm very new to Skritter, but I've found it very simple and user-friendly, and great to bring my writing up to the standard of my reading and speech. I'm not fully sold yet though - I've yet to see how well it works in tandem with real-life lessons!
One thing that I initially thought would be really handy would be a way to privately message other Skritter users. However, having looked around on the forums at all the other issues you're working on, I understand that this is a totally new system and would be really hard to implement what with security and all the extra features you'd need, so probably isn't high on the agenda.
So, back to the point (sorry!), this was the best way to try and contact another Skritterer (is that a word?!) "grahaml" to ask about a list they've created from my textbook (步步高中文2), and also, to ask if they've started compiling a list for the next textbook (步步高中文3) - to save me the job!