By using the toolbar on the left and combining the different marketing factors such as location, age, interests and so on, you should be able to recreate the niche you want to market.

Anyone interested in the niche of Spanish speaking female high income thirty-somethings in California who are into mucic? Ola, que tal?

You can find them on IntroNiche.

If not, just post a classified that you're interested to get in touch with people with similar niche marketing requirements.

Once you find kindred spirits, just contact them straight away by email to see if you strike a marketing deal that will benefit you both.

e.g. You want to promote a newly formed latin boys band?
Get in touch with all people targetting the niche mentioned above.  See if you can include free downloads of their first single in a targetted newsletter from a website giving fashion advice to the Spanish speaking female high income thirty-somethings in California who are into music.

Quite a mouthful, isn't it? But you get the idea. There's a win-win deal here for the companies and their niche markets.