This is indeed a problem. If a company has a name like newsfeed that is trademarked and then you start a business called Food Newsfeed and buy that domain name, can Newsfeed come after you when your business is not similar to them or is so generic that anyone can end up with that end name?
Can they force you to hand over the domain name? I think that is unfair (the domain name part), since you are not cybersquatting, but purchased the name to do business. What are the laws on this, or is it too new to really figure out who has a right to what, and how it is determined?