Users, including in the United Kingdom, Germany and Singapore, reported Friday that when they performed the search Bing returned the message, "There are no results for tank man."

Participants laid a wreath and held a moment of silence at the annual anniversary vigil — the only large-scale public commemoration of Beijing's brutal crackdown held on Chinese soil.

Some went missing. Some lost their freedom. Some can't escape the images inside their head, or the guilt they feel for surviving.