The term is 'slacktivism.' That's a portmanteau word such as smog or brunch or spork. If you know what a spork is, stop eating in school cafeterias.
Slacktivism has a negative connotation, of course, since it often results in you being urged to forward a warning to everyone in your address book about some bogus threat. A quick trip to Snopes: Debunking the Hoax could save you from annoying folks, but even that takes too much energy for some people.
"...the powerful impulse of 'slacktivism,' an on-line trend that combines our internal need to make a difference with the personal inertia that keeps us from actually making an effort." Arts Journal
Finally, in the spirit of giving, yours truly has found a site that actually does contribute something for the common good, doesn't cost me a thing, and upgrades my word bank quite a few notches.
Surely you, too, would like to know the meaning of the word 'vibrissa' or 'chaffer' or 'macaronic.'
Because of my modest efforts, over 40,000 grains of rice have been bundled along through a United Nations program to help feed the hungry. So far.
Although one friend noted he would "play all day if they added birth control to the rice" his half an hour of guesswork sent a packet of grain to a sad spot in the world.
Here you go:
chaffer = haggle
macaronic = mixing languages
Free Rice because you have nothing to lose.