If you want to take action and do your part in helping our world, I have listed two organizations and mentioned what they to so that if you care to donate, you know where you are putting your money.
Global Giving is an Organization that allows you to come closer to people, countries or communities in need. This site lists people needing your help and donations for various things. You could be the one helping these people and the amount of your donations is your personal choice.
The Global Fund is an organization that helps fight AIDS, Tuberculosis and Malaria. Yearly they raise an average of $4 billion USD to help programs that are led by local experts in the countries and communities that are affected and most in need.