one who vigorous posts political propaganda and petitions in an effort to affect change in the world without leaving the comfort of the computer screen
The act of participating in obviously pointless activities as an expedient alternative to actually expending effort to fix a problem.
Signing an email petition to stop rampant crime is slacktivism. Want to really make your community safer? Get off your ass and start a neighborhood watch!
One of those feel-good internet campaigns that doesn't actually help anybody or has political impact. It's your way of pretending to care while sitting on your butt in front of a computer playing WoW.
Also used for people who want to get a million people on their page by before bettering themselves or the world instead of just doing it.
Girl: Let's show our support by changing our Facebook statuses to promote what color our bras are!
Boy: Why does your status say "nothing"?
Girl: I'm supporting breast cancer awareness via Facebook!
Boy: One of the best examples of slacktivism I've ever heard of...