Is that a great word or what? Full explanation here, but this is a taste:

Slacktivism is the search for the ultimate feel-good that derives from having come to society’s rescue without actually getting one’s hands dirty, volunteering any of one’s time, or opening one’s wallet.

Found while reading an article on the great debunking site about the uselessness of internet petitions. I won’t be signing any more now, better to call or write your Congressperson over a particular issue – have you asked your Senator to save the Internet?