ON Wednesday, Kim Kardashian is going to die a little. So is her sister, Khloé, not to mention Lady Gaga, David LaChapelle, Justin Timberlake, Usher, Serena Williams and Elijah Wood.

That day is World AIDS Day, and each of these people (as well as a host of others  the list keeps growing) will sacrifice his or her own digital life. By which these celebrities mean they will stop communicating via Twitter and Facebook. They will not be resuscitated, they say, until their fans donate $1 million.

“Dry your eyes, everybody,” Ryan Seacrest, the “American Idol” host and another participant in this cyberstunt, says in a videotaped “Last Tweet and Testament” that will be posted on his Facebook profile  and appended to a final post on Twitter  sometime after midnight on Tuesday night. “I don’t plan to be dead for too long.”

He adds, “Please buy back my life.”

“Come on, y’all,” the actress Jennifer Hudson says in a similar videotaped plea. “Buy my life back. Go on a shopping spree and buy as much of it as you can.”