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10 years of Twitter: 10 celebrities helping to get every child in school

It's only 10 years old – but Twitter has had an enormous impact on the way people campaign for equal rights and opportunities.

The social media platform celebrates its 10th birthday today. Here we look at some of the famous people who have used their high profiles to highlight the need for every child around the world to be in school.

You can also see A World at School's top 10 tweets.

US President BARACK OBAMA sends out a strong message.

The actress KIM CATTRALL backs A World at School's #UpForSchool Petition by answering the call for celebrities to share their old school photos.

SHAKIRA, singing star and education campaigner, is a great supporter of A World at School – here's her son Milan with the #UpForSchool Petition book.

ANGRY BIRDS, the hugely popular computer game characters, take over the Twitter account of A World at School co-founder Sarah Brown to promote education for all.

The Lebanese singer ELISSA has sold more than 30 million albums – here she promotes A World at School's video about refugee children living in her country.

The model, TV host and businesswoman HEIDI KLUM shares an old school photo to promote the #UpForSchool campaign.

LAURA CARMICHAEL, who stars in the TV series Downton Abbey, has been working with A World at School to make people aware of Syrian refugee children out of school in Lebanon. Here she backs the #RewritingTheCode campaign to change perceptions of girls.

Palestinian-Canadian writer CHAKER KHAZAAL – author of the Confessions of a War Child books – backs the #UpForSchool campaign.

PRIYANKA CHOPRA, Indian star of Bollywood movies, is a big supporter of #UpForSchool and girls' education.

Superstar BEYONCE speaks out for girls and women through her work with CHIME FOR CHANGE. Here she retweets about a fan's charity run for girls' education.