Farewell, Digital World. (It’s All for a Cause.)

Wednesday is World AIDS Day, and many celebrities will stop communicating via Twitter and Facebook. They will not be resuscitated, they say, until their fans donate $1 million.

It’s all part of the latest gambit by the singer-songwriter Alicia Keys to raise money for her charity, Keep a Child Alive, which finances medical care and support services for children and families affected by H.I.V. and AIDS in Africa and India.