The Holocaust Memorial Day Trust has created a Twitter page and a Facebook page to increase digital participation in the event and a video, narrated by Harry Potter actor Daniel Radcliffe, has been released on YouTube.
The ceremony at London's City Hall for Holocaust Memorial Day.
The ceremony included a talk by Amonon Weinsteain, who restores violins which belonged to Jews in the ghettos and were played at the concentration camps. Violinists Charlie Siem and Victoria and Jack Liebeck then performed on the violins.
The Mayor of London gave a reading of Elie Wiesel's Never Shall I Forget and the crowd of dignitaries also heard testimony from two Holocaust survivors, Gena Turgel MBE and Zigi Shipper.
In a surreal moment captured on camera, tens of local Haitians were taught to sing Shalom Aleichem in Hebrew by Israeli volunteers from ZAKA, Chief Operating Officer Dovie Maisel and volunteer Dano Monkotavitz.
Israeli emergency volunteers from ZAKA rescued eight students from the rubble of a flattened university building in Port au-Prince, Haiti.
The six-team ZAKA worked for 38 hours with a Mexican military team to rescue the students, continuing over Shabbat.
Commander of the ZAKA mission to Haiti Mati Goldstein told Ynet:“With all the hell going on outside, even when things get bad, Judaism says we must take a deep breath and go on to save more people.”