06/01/2011 08:10 am ET | Updated Nov 16, 2011

Anonymous E-Card Urges Ex-Lovers To Take STD Tests

When you care enough to send the very best, you choose Hallmark. When you need to send the very worst, you choose an anonymous e-card that warns previous sex partners they should get tested for sexually transmitted diseases.

Since 2004, more than 50,000 such e-cards have been sent from -- tipping off partners that they should get checked out without revealing the sender, according to