Develop a social media website + application for telephones

I'm looking for a serious and responsible team of web programmer and designer who can develop a social media website from scratch for a specific industry, such as art lovers for example. The site has to function very very similar to twitter. We would also have to design the overall look of the pages (such as the bird, the clouds in twitter) and a corporate logo for the client. Then, as phase b, we would have to develop a movil application for androids, i-phones and blackberries so members can access the site through their movil phones. I'm looking forward to receiving estimates (with time frames and quotes) for: (I) web developing and designing (II) movil application. I'm very interested in professionals who have experience in this kind of projects. I would appreciate to receive examples on projects related to this one. Please let me know if you have further questions. Thank you. Daiana