Slacktivisim: "feel-good measures, in support of an issue or social cause, that have little or no practical effect other than to make the person doing it feel satisfaction. The acts also tend to require little personal effort from the slacktivist."
A good example is an Internet petition that circles around the web doing nothing except making the people who spread the petition feel good. What about taking shorter showers to help solve the world water crisis? Surely that's got to be good.
Taking shorter showers is good on a local and personal level. However, it does absolutely nothing at all for people in developing countries who don't have access to water. In fact, 90% of the water used on the earth is used by agriculture and industry. If everyone on the plant stopped showering, we'd save 10%. Ten percent is great savings, but if you really want to help solve the world water crisis, you'll need to take action that causes industry and agriculture to reduce their use of water.