LONDON - At these Olympics, Twitter is fire. Depending on how it's used, it can warm like a gas fireplace or scald like a blowtorch.
Twitter, the 140-character social media site, was barely a blip on the radar during the Beijing Olympics. Four years later, there are reportedly more than 500 million registered users worldwide, and the social media site has made a bigger impact in London than some Olympic teams.
In the past week: Two athletes were sent home from the Olympics for racist tweets; a current U.S. women's soccer player used it to chastise a former member of the program; a journalist had his account suspended after criticizing NBC's coverage, and countless viewers have used Twitter to complain about delayed television coverage -- and their inability to avoid Twitter long enough to avoid finding out results before events are aired in prime time.
Those are only some examples, though most athletes use Twitter as a safe way to be accessible.
Michael Phelps' record for most career Olympic medals has been the story of the Games so far, and it quickly became one of the most celebrated stories on Twitter. Late Tuesday night, after Phelps set the record, President Obama tweeted, "Congrats to Michael Phelps for breaking the all-time Olympic medal record. You've made your country proud. -bo"
Phelps wrote back: "Thank you Mr. President!! It's an honor representing the #USA !! The best country in the world!!"
But within a few days of arriving in London, two athletes embarrassed their countries via Twitter. The Swiss Olympic Committee sent home soccer player Michel Morganella for a racist tweet about South Koreans. The Greeks did the same with hurdler Voula Papachristou for a racist tweet about "Africans."
American hurdler Lolo Jones did not face overt punishment for her tweet, in the aftermath of the mass shooting in Aurora, Colo., that read, "USA Men's Archery lost the gold medal to Italy but that's OK, we are Americans...When's da Gun shooting competition?"