British government prosecutors have set out new guidelines to make it harder to bring legal cases against people who send offensive messages on Twitter and Facebook.

With one year to go until the opening ceremony of the 2012 London Olympics, swimmers took the first plunge Wednesday in the new aquatics center hailed as a "masterpiece" by IOC President Jacques Rogge.

With most of the venues already completed, tickets nearly sold out and a massive security operation in the works, London is preparing to mark the one-year countdown to the biggest sports show on earth.