The statue of Christ the Redeemer is lit up in blue for the "Light It Up Blue" campaign to mark the World Autism Awareness Day in Rio de Janeiro
The statue of Christ the Redeemer is lit up in blue for the "Light It Up Blue" campaign to mark the World Autism Awareness Day in Rio de Janeiro April 1, 2015. Pilar Olivares—Reuters

There's a Reason Everything on Facebook Is Blue Today

Apr 02, 2015

Earlier this week, Jay Z asked a group of musicians to turn their Twitter avatars bright blue to promote his new music streaming service, Tidal.

But on Thursday, social media users might be noticing that many of their friends, family and, yes, favorite celebrities have decided to "Light It Up Blue" as well. And it doesn't have anything to do with a paid music subscription service.

April 2 marks National Autism Day, and to raise awareness, Autism Speaks explains on its site, "Thousands of iconic landmarks, communities, businesses and homes across the globe unite by shining bright blue lights in honor of the millions of individuals and families around the world affected by autism."

https://twitter.com/davidefaraone/status/583366419364122624

https://twitter.com/AutismSpeaksEAC/status/583336557551063040

And, of course, people on social media are participating by posting photos of themselves sporting the color and pictures of loved ones who have autism, all with the hashtag #LIUB.

Even celebrity ambassadors Ronan Farrow and Carole King are getting in on the action:

April is Autism Awareness month - thanks to @carole_king for putting a spotlight on a cause close to home for so many of our families.

Posted by Ronan Farrow on Monday, March 30, 2015

This blue definitely doesn't make you feel blue.

TIME may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.