Social Networking - Entity Relationship Diagram

Wow!!! This I am finding really hard I am writing this post to prove that I have been trying to create this diagram but am finding it extremely difficult and that if I do come to the seminar tomorrow with lots of noted paper its not because I haven't been trying but its because I can't find a way to create my diagram.

I have come up with the idea that is based around what we are trying to do this year. My plan is to create a social network that links between the students and the companies, reasons for choosing this is because I constantly hear about the troubles students have trying to network with companies. Now I know that this is something that we students have to do independently but what if there was a networking site that helped design companies see the work (blogs) of potential employees. It would help both the students and the companies because companies always have an idea on who they want to take on, by looking at that the students work that the students have posted they can see who they want.

If I was to describe what I am trying to do briefly then I would say that it is like an online scouting service, my initial idea would be mainly for online environment people but that could expand.

So who are my entities? so far I have:
- Company
- Students
- Blog
- Course

And thats where I'm stuck potential thoughts were 'project', 'University' I could maybe use 'users' as a link entity between the company, students and blog, but I shall talk to Simon and see what he thinks.