|This chart shows hourly tweeting for Oxford Street from through November, December, and early January.|
Beyond the lack of a bump in Tweets coming from Oxford Street there is a dramatic lack of Foursqaure checkins to major retailers in London, with only Selfridges & Co, Apple Store and Liberty showing significant foursquare checkins.
Most Foursquare activity were at public spaces and events, leading me to wonder if people were looking for cheaper days out. Tate Modern, Covent Garden and public Markets were major locations for Foursquare.
It is very hard to draw conclusions from Twitter and Foursquare public data, but these numbers do not indicate a large surge in Christmas shopping at the end of 2013 in London.