93 of the world's top 100 brands have their twitter name taken by someone else

"Of the top 100 global brands, 93% have had their Twitter usernames taken by somebody else (i.e. Twittersquatted).
Twittersquatting, like cybersquatting, is when somebody registers a company's trademark (or a famous person's name) as a Twitter username with the intent of profiting or causing confusion. Other possible names for this practice include username squatting, usernamesquatting, squitting, usersquatting, and brandsquatting."
Source: Erik J Heels, 9th January 2009. Includes a list of the 100 top brands and whether or not their own their twitter name. The only 7 that own their own names are Accenture, Blackberry, Harley Davidson, Oracle, Starbucks, Thomson Reuters & Yahoo