Mobile app to read Facebook and other social site feeds.

Hello. I need to 1. Qualify your level of knowledge and skill for a required Mobile app. I also need to thereafter confirm your answers against work you have previously and successfully completed for someone else to ensure your quality and skill are there. I have compiled a few basic questions that relate to the mobi app that I wish to build. Just answering YES is not sufficient. I need to see your background and possible alternative methods of 'skinning the cat' (i.e.- differing ways to do the same so please support your answers) **I require this mobile app to be multi OS compliant with most popular OS's however we can start with the 2 most popular OS'** Android, iPhone/iPad, Blackberry, Windows **Interview questionaaire. ** I know FB offers APi's. I can see that I can use the FB Auth script to allow users to login to my own website using a common ID. **Question 1** FB offers it's own Mobile Facebook App but can I create a similar mobi app myself with my own layout, settings, buttons etc? (expand on this answer) **Question 2** Does FB offer an API so that I can create the logged in users daily feeds, comments and view picture uploads, shared items etc from friends? **Question 3** I wish to do the same for Twitter, FB, and 2 further popular social websites. Can this be done? **Question 4** What simple technology (scripting type/s) would you utilise to do so and why are they your chosen methods? **Comment** I wish to perform all the above but without rebuilding the wheel. In other words I wish to build a script that I can plug-in to my existing mobi app to perform similar tasks to the above mentioned items.