Twitter CEO Dick Costolo and staff go purple, join Twitter users in standing against bullying on #SpiritDay

Twitter CEO Dick Costolo joined employees on Friday in wearing for #SpiritDay in a stand against bullying and to show their support for LGBT youth. The company's LGBTQA group, Twitter Open, tweeted a photo of some of the staff with Costolo, saying, "We are wearing purple today to show our support for #LGBT youth and to stand up against #bullying #SpiritDay."

Twitter has been intrumental to the success of this year's #SpiritDay, with celebrities, students, LGBT people and allies taking to the platform to show their support. The volume of tweets about Spirit Day grew so large that the hashtag #SpiritDay was trending for parts of the day in the United States.

Other tech companies supported Spirit Day as well.

Social media is critically important to spreading the word about Spirit Day, and supporters are encouraged to make their Facebook and Twitter profile photos purple using the tools on the Spirit Day website, Even President Obama and the White House went purple on Twitter for Spirit Day.

To see other tweets sent in support of Spirit Day, see or #SpiritDay on Twitter.

Facebook Chief Operating Officer Sheryl Sandberg and colleagues at Facebook’s headquarters and offices around the world participated in Spirit Day today by wearing purple to speak out against bullying and support LGBT youth.

Tumblr supported Spirit Day on its social media channels and posted a video on its Storyboard blog about the importance of standing up against bullying.  

Mobli participated by creating a special Spirit Day channel where users can share photos of themselves wearing purple to stand up against bullying. 

Yahoo! Participated  in Spirit Day again, kicking off by posting about Spirit Day to its Yahoo! Pride page. Last year the company went purple on their social media sites, posted about Spirit Day to the Yahoo! OMG Blog, and enouraged employees to wear purple.

GLAAD provides graphics that can be shared on social media sites.

Supporters are also encouraged to upload photos of themselves wearing purple to TwitterInstagram, and Tumblr using the hashtag #SpiritDay.