Malala Yousafzai has officially entered the Twitterverse. 

Jessica Rinaldi/AP - apimages.com

And she's not wasting any time.

Malala's first tweets ever are already going viral—with more than 16,000 retweets and 51,000 favorites—for spreading a poignant message about girls' education around the world. 

Yousafzai rose to prominense in 2012 after she was shot by the Taliban for her vocal advocacy of girls education. After the incident, she was awarded the Nobel Peace Prize. 

In her tweets, she talks about feeling "bittersweet" because the gender disparity in primary and secondary education around the world is still too high.

She also tweeted about her #GirlPowerTrip, for which she'll travel throughout North America, Europe, the Middle East, Africa, and Latin America, to meet girls who are still unable to access education and speak to community leaders about efforts to close the gender gap in their countries. 

Millions of girls around the world are staying home from school.

Despite improvements over the last decade, there are still more than 130 million girls out of school around the world today, according to the OHCHR, a United Nations agency fighting for human rights.

The disparity is higher in war-torn regions and countries routinely facing violence from militant groups or drug cartels.

"Women and children are particularly vulnerable to human trafficking, sexual violence, and exploitation in crisis settings where many militant groups operate," according to the Brookings Institution. 

But Malala says she will continue to fight.

"On and off Twitter," Malala Yousafzai and her organization, Malala Fund, continue to fight for gender parity in primary and secondary schools around the world. She may be new to Twitter, but as a long-time advocate of education rights for girls and safety in schools, Yousafzai is not new to this fight. 

Her last tweet sends a message of hope and invites collaboration as she asks, "will you join me?"