In removing some questionable political graffiti from its servers, YouTube raised the contentious question of how it decides what is offensive enough to censor.

Parents are not the only ones keeping a watchful eye on my space. Five school districts we contacted in the Rio Grande Valley say they have blocked the website from school computers.

A new school in the Masai village of Oloolaimutia in East Africa runs day and night now, even though the majestic tribe lives without electricity or running water in its nearby compound of mud houses. More than 400 children attend the school, which uses s...