Launching Facebook and Twitter application from other iOS app

Hey guys, I am still continuing to build my iPhone project and I am having trouble with launching the facebook application. First of all, I am assuming every SDK Xcode developer knows that the Facebook application doesn't have the facebook or twitter app in the simulation. Since I have a facebook page and a twitter account about my company, I can't seem to test to launch my facebook page from the facebook application or my twitter page from the twitter application because they are not there in the iOS Simulator. So I was wondering how can I open my facebook and twitter page from the facebook and twitter application if they are not there? I don't want to use a Facebook or Twitter URL, then load it into a UIWebView, I want to open the Facebook and Twitter application to launch after the click of a button in my project, then the project will close and open either Facebook or Twitter application (the ones from the app store), so hopefully someone know how开发者_StackOverflow they can help me step by step or if they have a code that knows how to run the facebook or twitter application and sorry if my english is not clear enough, but hopefully you can help me or have a better solution to help solve my problem, thanks

I believe the facebook app listens to URI's like fb://, so I would suggest googling around for that.

Look here for example: http://wiki.akosma.com/IPhone_URL_Schemes#Facebook