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21. Do Good—Better

Figuring out where to put your philanthropic energy can be surprisingly daunting. Enter AllForGood, a service-based Web site that does the sifting for you. Inspired in part by Craigslist founder Craig Newmark and developed with the help of Google engineers, the smartly designed site is a centralized search engine for volunteer opportunities, culling more than 150,000 postings from matching sites like Idealist, Catchafire, Truist, AARP's Create the Good, and United Way. Filter listings according to your interests, skills, neighborhood and time frame, whether you're seeking a one-day project building a playground or a weekly soup kitchen gig.