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https://www.taskrabbit.com/ is the closest website I found to what I want to do. It's about people helping each others with their To Do lists. From implementation standpoint, the main addition will be the integration with Facebook. The main functionalities will include seeing friends' activities, rating, posting comments, exchanging messages,...After doing some research, it seems that Drupal meets my need for implementing the site but I'm open for suggestions. I have the domain and hosting service set up.
I'm new to the freelancer site so I don't have rating yet. But I assure you that I maintain a professional attitude and I can provide any guarantees. I'm a Software Engineer myself, with a PhD in Computer Science, and I worked on many small to big projects so I won't have unrealistic requirements.