Support group for overcoming alcoholism.

Public file sharing without identification.

Support group for addiction recovery.

an international fellowship of people who have a compulsive gambling problem.

Support group for anonymous parenting.

a form of one-night stand or casual sex between people who have very little or no history with each other, often engaging in sexual activity on the same day of their meeting and usually never seeing each other again afterwards.

Testing without revealing personal identity.

Service hiding sender's identity online.