...With a little help from some friends

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I've been tossing around an idea for a startup that involves companies giving out free products to consumers. (Strangely enough, this actually takes place and happens all the time) The businesses get customer feedback, product testimonials, etc. But in order for my idea to be a success, I need to round up all reasons possible for a company to want to do this and implement them in my strategy. Thanks in advance for your feedback.