There were 1.4 million tweets mentioning Sir Alex Ferguson within an hour of his retirement

"If you want an idea of the reverence with which Sir Alex Ferguson is held, Twitter has an easy guideline: more than Margaret Thatcher, but less – so far – than the new Pope.
That's the conclusion that emerges from the number of tweets surrounding the three events – the death of Lady Thatcher, the announcement of the new pope, and this morning's announcement by Manchester United's press office Twitter account (at the newsdesk-friendly hour of 9.17am).
According to data collected by Twitter, the hour after Thatcher's death saw a million tweets in the following four hours.
Sir Alex broke that easily, as the much-expected news of his retirement from the manager's job had more than 1.4m mentions on Twitter within the first hour, and the original story was retweeted and "favourited" more than 18,000 times, according to official Twitter figures.
But the announcement of the choice of Jorge Mario Bergoglio to be the new pope on 13 March garnered substantially more mentions, 7m, demonstrating that while football may be a religion for many, it still has a little way to catch up with the officially recognised ones, at least on social media."

Source:  The Guardian, 8th May 2013