Facebook, Twitter, & Other Social Sites Develop Apps for Windows 8?

I know that the People app for W8 that Microsoft built has Facebook, Twitter, and other social platforms built into it. Personally, I was hoping by now that developers for Facebook, Twitter, Pinterest,etc. (not third party apps) would have developed and released a separate stand alone app like they have for WP for testing before W8's Friday release date. What do you guys think? Do you think they will release something on the 26th, a little bit later on, or not at all?