Here are just a few of the online networks and databases which have mobilized in the last few days to help relatives abroad locate family and direct urgently needed help to survivors, many of whom are still trapped beneath the wreckage of their own homes.
The International Committe of the Red Cross has an extensive online database of the missing  where friends or family.
Major news organizations like the New York Times  and CNN  , as well as Google , have also set up databases for the missing. A site called Haiti Earthquake Support  Center is working on a tool which would allow volunteers to help match faces in news photographs to faces of missing persons.
Ushahidi , used to great effect during the Kenyan election crisis , is also mapping crisis information , including missing persons reports, information about collapsed buildings, and road conditions.
On Twitter, the tag #relativesinhaiti  is being used by Haitians abroad who are still trying to locate missing relatives. Meanwhile, #rescuemehaiti  is being used to direct search & rescue efforts to specific addresses around Port-au-Prince where survivors are known to be still trapped under the rubble:
Christopher Frecynet still alive. They heard him screaming. 64 Rue Nord Alexis. Call cousin Daphney 509-39046983
63 people still alive Carribean Market. survivor sent txt so we can send help. PLEASE LET PPL KNOW
Heloise Boyer is trapped in her house #40  Rue O, Turgeau.
HELP IS NEEDED ! People still alive under College Canapé Vert are screaming for help to get them out …