Web Site To earn

Good Morning, My request is not a project very definite, indeed I ask you to spazziare with imagination and offer me what comes to mind, then I'll evaluate if it can be feasible or not. Vorre receive a proposal to develop a Web site that contains ecomerce or Forum or Social Network or anything that has the possibility of an income or gain and income is earned. I already have the ability to insert ads which would increase earnings, but the 'main activity should not be focused on ads such as Google Adsense or anything, but a completely different system that coprenda sale, Forum, Social Network or whatever you can think of that might make a profit safe. Please specify the type of Visula Code, Software and hides everything with you develop the project. The sector in which the project is intended to be close to my main activity my current job "This is the Web site: [login to view URL] ": Mechanical Design Engineering sector: Automotive, Industrial Automation and much more, but as I have already stated should not necessarily be focused on this, in fact I can evaluate any proposal. The project could focus on what I already have the my work, but can also be a 'idea completely different. I hope I was clear and I explained myself, but if you want more clarifications and information are available at any time. Good job Francis