Dear Sir,
I am a web entrepreneur having over 4 years of experience in Web Development. I run over 10 websites which serve 200000 unique visitors per month. Though I am relatively new to Freelancer.com, I have been involved with other similar websites for long.
I shall develop your app using official Javascript SDK and PHP SDK. The user interface would be in HTML, while other core functions would be taken care by Javascript SDK. The messaging to group members would be managed by PHP.
The user will log in to Facebook, select the group from dropdown, enter the message and the message will be sent to all users.
Please note that user_groups permission is approved only for Facebook clients, hence it is likely that this app will not be approved by Facebook's Review Team. This means that only the administrators,developers and testers of the app can use it.
Please let me know if you are interested. I have recently finished a big project of Facebook canvas app development, so I am fully aware and resonated to recent changes in Facebook App development, its SDKs and Opengraph API.
Please feel free to discuss any concern about the proposal. Looking forward to hear from you.
Regards
Wifione