I don't have support for the Notifications & Push APIs, but I jut login and browse as would be. As for posting, I had to make some extensions and tools. Not ready for release but maybe someday I'll make a 'Temp app. Making apps from a Vita directly is hard though.
How hard? Well for dev tools, there's LUA but there's 3 compating solutions, each with varying & different APIs for system stuff. Nothing for GUIs yet despite documentation from LuaPlayerPlus. Can't decide on what's most promising. Then I know nothing about the VitaSDK as I have no PC. And for basic file editing, I can't even reliably search for text in a txt file with VitaShell. Notepad++ was ported but sucks.
Oh.......... Now I see what you're talking about and such. Hopefully you're able to develop something sometime soon, I have been heating great things about the Vita scene, and it makes me wished I had one fo rmyself, too. I wonder if it's still striving to this day?
Thanks. The scene's pretty active with new ports on VitaDB Downloader and translation patches. (Pop over to the Vita forum). They're not too hard to find either. I'm still waiting for FF6 (mobile port) to be ported.