Do people who work for companies patrol this site to "defend" the company or to slander competitors, while?

Obviously there will be people who work for a brand on here, and if they answer a question about that brand, they'll obviously have a bias answer. I doubt people actually spend time looking for questions about the company that they work for. There are also people (That do not work for that specific company) that will answer, and have a bias answer because they like that brand.