Idea #4 — Ultimate Review Website
Tl;dr: A website where the user will search by the name of any product or service and receive a score based on reviews from social networks and other sources.
How it would work
People would be able to search a product and get a score that reveals how good or bad the product is. They would also get some of the most relevant comments about the product.
You would also have a referral link for people to buy that product (this is how you make money).
Simple enough idea with a lot of technical work behind it, but can definitely work. The truth is that no one buys anything anymore without checking testimonials and a website like this is bound to exist in the near future.