Theoretically yes if you are running Nookie Froyo or CM7 (Gingerbread). Flash Player hasn't been released for Honeycomb yet. There may be some issues but I'm sure the devs are working on it.
Haven't tried posting on here from it. I tend to use my Nook more for reading/viewing, and my laptop and G2 for typing. I get frustrated trying to type anything more than a couple sentences on a virtual keyboard. I'll give it a shot.
One fear I had about getting a phone with no keyboard was typing, but luckily my Defy has Swype. I fucking love Swype, i would have hated having to type on a touchscreen.