Some major web sites will go dark for one minute Friday at 9:30 a-m Eastern as a national moment of silence for the victims of last week's Connecticut school shooting.
More than 100,000 people and sites have pledged to participate on Causes.com.
People and companies are also spreading the word by tweeting with the hashtag #momentforSandyHook.
Any site that wants to participate Friday can do so on its own, or embed an official badge with a green ribbon on its site.
To to that, go to the site to sign up.