The community weathermen of Kisumu County

When we consider the vast sums that governments spend — and the responsibility public officials bear — it seems crazy that policy makers don’t routinely make good use of evidence. The new White House effort to base spending decisions on hard evidence is a step toward delivering more social good per taxpayer dollar.

In India, videos made about the many social problems are secretly broadcasted in different villages to make people aware of the real problem and also aware of what they can do to fix it. Video Volunteers, an organization that coordinates these video productions, catalyzes community change through transparency and accountability.

Citizens in Cairo have been working to make the streets cleaner in an effort to create more pride for the country and get the government's attention. From picking up trash and painting lampposts to collecting donations from passersby, the community is working together to make a new Egypt.

Adolescent smoking remains a challenging health problem because of the allure of cigarette branding. Australia is piloting the transformation of cigarette packaging with a generic look that reduces the appeal of smoking. In Florida, the Truth campaign has exposed that cigarette companies targeted teenage consumers and, in response, created a set of new advertisements that presented the cigarette industry with transparency.

The ability of social media and online civic participation to impact law and politics is still developing, but one social media tool - Friendfactor - was used successfully in New York to help bring about the passage of Gay Marriage Equality. It may be an indicator for how powerful platforms like this one will continue to play a role in societal growth and change.

New crowdfunding options can help even the smallest donor's contributions to have a meaningful impact, bolstering a sense of personal involvement, maximizing knowledge about causes, and inspiring greater participation.

Two columns on Time Banks, where people swap services – teach calligraphy to one neighbor, and get computer repair from another neighbor. Time Banks create community and make people healthier – which is why hospitals and clinics are now starting them.

Poor neighborhoods in the United States lack quality play spaces for children, also known as play deserts. An organization is enabling communities across the nation to build their own playground.

Global social and economic problems are difficult to change. However, fan-activism fuels the interests of fans of popular young adult fiction. Books such as Harry Potter and the Hunger Games have inspired activist groups that raise awareness of global hunger, reading, and relief supplies to impoverished nations, among others. Being a fan has served as a bridge to become politically active and solve the world’s problems.

The United States now has a variety of federally-supported nutrition programs, but the health care system remains disconnected from the social determinants of health. Many doctors simply lack the resources to provide the comprehensive care proven to have greater impact on health than strictly medical treatment. A group called Health Leads is training young volunteers to treat the social factors, like poor nutrition and housing needs.