Traffic to the BBC website on key days of the Olympics exceeded all the traffic for World Cup 2010

"The BBC's promise was to deliver coverage of every sport from every venue, and we certainly achieved this with our digital coverage: from the blue ribbon events like the 100m final all the way to the first taekwondo heats, the multi-faceted entirety of the Olympics was available to watch throughout the day across online and Red Button.
Overall, this comprehensive coverage drove very large amounts of traffic to the Sport website and to Red Button channels.
BBC Red Button - BARB reach (people aged 4+), with threshold "watched 15 consecutive minutes or more" - in line with BBC TV channel standard metric. Cookie churn means the BBC Online figures will include some unavoidable duplication over this period.
And the peak audiences for Team GB's medal moments were bigger than anything we've ever seen. Over a 24 hour period on the busiest Olympic days, Olympic traffic to bbc.co.uk exceeded that for the entire BBC coverage of FIFA World Cup 2010 games. On the busiest day, the BBC delivered 2.8 petabytes, with the peak traffic moment occurring when Bradley Wiggins won Gold and we shifted 700 Gb/s.
BBC Sport Online's most requested live video stream was of the Tennis Singles Finals, where Andy Murray and Serena Williams were victorious."

Source:  Blog post by the BBC, 13th August 2012

Note - Click on the link to see the top 10 events