Meneame.net

Meneame. net its a grate example on what you can achieve on the web. A teacher that launched his web page in order for the users to rank the content  that is being posted. It seems a very simple thing but its a great idea that it is based on few users that feed the net and those few users make the page rich and desirable for the rest of the users. The majority of the users benefit from the input of some few users and depend on the quality of the input of this minority. So the page becomes a "reliable" source of information. 

On the other hand, making this scheme profitable would only be feasible, in my opinion, based on charging companies interested on reaching this particular community and not charging the user. Also taking into account that Meneame.net is based on trust or credibility on the ranking, it would be a very bad bet to let the sponsors intervene with this process, but you can let them post their information on the side that does not intervene with the essence of the page. Also we have to do a very big assumption and this is that the users will not interpret this making money practices of the web page as a possibility of  affecting the rankings and comments. Also you run the risk that your "costumers" interpret advertisement as a way of the page of  being biased and even that a authentic good comments appear on a article posted on Time magazine, for example,  and Time magazine is actually paying tho post its information, users can easily thing the companies are intervening   with the content of the page, even if a user made the good comment. 

Under the assumption of working in mename.net I will suggest to include the possibility for the user to reach the newspapers, books, magazines, etc. This means to become a broker for subscriptions to all forms publications. We already know that our costumers like or have a tendency to read all this kind of publications and if we offer the possibility of subscribing to a magazine that the user reads comments about very often can be a very profitable idea. So the users feed the page on what their interest  are and we can offer related publications in order for them to buy them.