What are the best free advertising sites on the web?

Are there any good web advertising agencies for financial web sites (publishers) in the US?

• We are a web site providing information on the venture capital and private equity industry (http://pseps.com) and are satisfied with the agency selling our ad space in the UK (WebAds), but have been less lucky with the US traffic. Is there any US equivalent to WebAds in the US that works specifically with publishers of financial information, and if not, what would be the closest alternative? Thanks!

• Answer:

  They need to be familiar with compliance issues. So make sure they are well-versed in compliance for financial companies. Every social media post has to be archived. Every blog post. Even those done in-house, even on mobile. I had to learn to comply for clients. That's how I found out about it.