Mouthshut is the best way to earn money online, on mouthshut you can write unlimited number of reviews and also earn a lot of money from these reviews, what you have to do is to write quality reviews and your personel experiences on the products you actually use or have used at least once.
Even if you have a problem with any problem with a particular product then just write the review on that product and that company will respond to your review and will provide you with a solution to your problem.