Networking/Jobseeking site

In am looking to create a professional networking website targeted at University students and recent graduates. The main aim of the site is to facilitate effective communication between people looking for graduate jobs and graduate recruiters. Therefore, I need the website to allow people to create a user account on the site the site to enable messaging between students and businesses. To enable the messaging service to work effectively I would need the site to allow student users to input data which the companies can then use to send messages to them. For example, the company may choose to send messages to students who are studying Engineering in Universities in the North East. I would also need the website to be able to offer student to student messaging on a contact basis, like people can contact their friends on Facebook. Additionally, the website needs to have a careers search engine (or filter) and therefore data would need to be captured about the companies and the jobs they offer. This again would require a database and the students could use it to find desirable jobs such as ones that match their qualifications and is located in a specific location. I would also need extra features like a profile for students, companies and careers services. I would also like there to be user generated blogs and advertising on the website. I would like a favourite jobs page which users can save jobs to.