Over at CartoDB, Twitter has created a rolling heat map for yesterday's World Cup match, highlight USA- and Ghana-centric geotagged tweets over the nailbiting 90 minutes. It's interesting to see what cities provided the most chatter; it's fun to see America go up in flames after goals.
On the map (which can be panned and zoomed to satisfy your particularly curiosities), red indicates Ghana tweets; blue is the U.S. Here's a Vine showing the domestic tweetstorms for, in quick succession, Ghana's equalizer, John Brooks's winner, and the end of the match.
As far as volume goes, the biggest international hotspots were in Rio de Janeiro, São Paulo, the U.K., and, naturally, Ghana. Domestically, the map matches up well with the top 10 TV markets for the game: