Donorschoose.org is running a Social Media Challenge and it’s easy to get involved. You can pick a Twitterer to support or you can create a giving page of your own. Last year this program raised $270,000 to provide 65,000 students with the resources needed to learn. Make sure you add yourself to the Twitter group—if you get stuck, visit the help page.
One of the proposals among several I’m personally hoping to get funded is Making Science Fun! Ms. M’s Classroom is a high poverty school in Arkansas. The fourth graders need sets of books about simple machines, properties of the earth, electricity, and matter as well as hands-on activity tubs for each topic. The letters the kids write to you after donating are their own reward.