@WeCare, a cause marketing platform generating funds for nonprofits, is holding a Charity Challenge where Twitter tweeters can tweet a registered brand's handle to donate to a cause. The company, focusing on shopping, searching and viewing ads, launched the #MillionDimes $100,000 Charity Challange to give away funds. For example, every tweet -- up to five daily -- will earn a $.10 donation for the registered charity whose handle appears in the tweet. Twitter tweeters can support up to five charities daily, one charity several times a day, or any combination. All tweeters must Follow @WeCare on Twitter, and the tweet must include specific information. Search in the list of hundreds of organizations.