It's Zombie Apocalypse night.
If Colin Firth is here to whore something, it's probably Magic in the Moonlight despite Wikipedia listing it as in post-production, but he is slated for 3 other films this year one of which is still shooting. Otherwise he might talk about British politics (he has publicly dropped his support for the Liberal Democrats over tuition increases) or his other activism which includes membership in Oxfam and a study commissioned and co-authored (at least he's listed as one) about the Liberal and Conservative brain.
Sheryl Sandberg is a 1%er Harvard graduate worth over $1 Billion in part due to her job as COO of FFB (if I have to explain you don't use it) who's recent interface changes are all bad making a product that is notorious for it's creepy privacy violations and impossibility to use for all but the most trivial purposes even worse.
I wouldn't have thought it could be done, but that's why they deserve those big bucks.