Rowan Atkinson’s cameo performance sparked the biggest spike in mentions of the event on Twitter. The comic actor appeared with the London Symphony Orchestra, playing a single note on the piano during a rendition of Chariots of Fire. London 2012 is the first Games to see Twitter play a major role, with the Olympics mentioned by more than 10 million users since Friday’s ceremony. Lizzie Armitstead, the British cyclist, gained new followers at a rate of 500 per second after winning silver in the women's road race Sunday, with more than 25,000 following her less than an hour later.