Now that Givver, the Twitter-based charity tool, has been around a while, here's a longer piece from its hometown paper describing mission.
"The premise is simple. Input your credit card information, link Givver to your Twitter account and make your next tweet benevolent by identifying your desire to give, the dollar amount, and the nonprofit organization’s Twitter handle (Givver also handles political donations). In practice, that translates to: #give $(amount) @(organization)....Givver co-founder Chris Sommers, who also owns the Pi and Gringo restaurants, believes he can help charities and eventually make a buck doing it." --Hannah Cushman, the St. Louis Post-Dispatch