Social Media Network - Specialized

We need a website, that will have a social network, this social network is for a specific field that we will provide when discuss with the developer, basically it will contain the following: 1- Login/Sign Up (Social integration) 2- User groups, as every group will have different permissions. 3- Mostly the normal facebook features, from uploading photos to videos, also others will be able to like and comment on the posts. 4- A message board, where a user can post ads. 5- Blog/News section. This is a basic idea... we have more details, but we will NOT provide the design. One last thing, don't post the usual stuff, if you dont know how to do it, please do not post. Also, this is a low budget project, so, please keep it as low as possible cause we wont have an agreement other than that.