The linking the week site for this week is Help a Reporter Out (HARO). The premise of HARO is that everyone is an expert in something, letting journalists find sources to help with their story. The service costs nothing to journalists or sources, but Peter Shankman who manages this website asks if you do want to contribute to make a donation to an animal hospital or animal rescue society somewhere.
There are some rules about SPAM on the list, and also you should question youself if you are really qualified to respond to any of the queries which are sent by e-mail three times a day during the week. If you are a journalist than this is something you should look into, and likewise if you need to represent clients or your product it allows you to connect to the media when the opportunity is right getting some needed free publicity and knowledge you are an expert.