it depends what the lie was really, and who it was aimed at.
with constant update on new friends, status updates, my favourite football team, cars, cartoons of the 80's etc etc, all the poking, hugging, sheep throwing, and giving of tequila, life is just too fast and people move on to the next thing and forget what hapened yesterday or even 23 minutes ago when chantelle was 'bored' and 20 minutes ago when chantelles was 'looking forward to the weekend' etc etc.
so all in all, depends on the lie but i "would" just let it go and hope everyone ignores it just like they do most of the above. and then forgotten it tomorrow.
i "could" brush it off with a reply remark that just debunked the lie and made the instigator look stupid, but then that just gets into a he said she said debacle. so id just let life move on as it does.