Target Niche Audiences with Facebook Advertising
If you haven't tried advertising in Facebook yet, it might be worth a shot. Facebook is the social network site that brings friends together according to interests, existing connections, networks and groups.
You can place ads and display them to anyone on Facebook based on demographics, interests, hobbies and so forth. It's a good way to reach very targeted audiences. User information is current, updated often, and accurate.. unlike a lot of direct mail lists, which can be outdated, inaccurate and expensive.
Since Facebook doesn't tie results to exact searches, your ads are not as granularly exact as something like Google AdWords. However, you can reach really targeted audiences for very little money. If you're selling archery gear on eBay, for example, you can run ads that only display to people who list archery in their profiles.