Where is the best place for FREE online advertising?

Traffic exchanges are worthless except traffic swarm and ts25 and there are a few others, but as far as promoting your business in traffic exchanges it won't work because think about it everybody using traffic exchanges have a business and what are they trying to do Get more traffic to their site, they are not looking for another business unless they are unhappy with thire current business. I'm having alot of sign ups through traffic swarm. If you have something that will help other people with their current business then you will get sign ups, because that is what people are looking for! how to get traffic and more sign up to their website. to their website