Online dare

Vietnamese alarm over Facebook dare trend

How far would you go for a million Facebook likes?

For one young man in Ho Chi Minh City, the answer is serious injury, possibly death. He has promised to jump off the fourth floor of a tower block if that many people "like" his pledge to do so.

The incident is just one of many linked to a viral trend of #vietnamnoilalam, or "Young Vietnamese will deliver what they promise".

The trend appears to have been started by the man pledging to jump, who the BBC is not naming.