Tom's agency, WME-IMG, just entered into a content partnership with Unicef. Quote from Variety below. Is that part of why Tom mentioned Unicef at the Globes?
http://variety.com/2017/biz/news/wme-img-unicef-partnership-1201957243/
UNICEF was briefly mentioned in Tom Hiddleston’s speech following his Golden Globe win for best actor in limited series. Hiddleston, who is repped by WME, is a major supporter of the organization, and was featured in a video message at WME-IMG’s recent retreat, expressing his happiness that the company is partnering with the cause.