Twitter talk is dominated by celebrities, sport and TV, a list of the top 25 Twitter search terms reveals.
The most searched for term was "Twilight" - a reference to a US DVD about vampires, the research by Hitwise, part of Experian, shows.
Paris Hilton was fourth on the list, outstripping searches for Obama, which was the seventh most searched for term.
A couple of US basketball terms featured in the top 25.
On a more serious note, a couple of news agencies featured, which demonstrates that users are sharing news on the site.
But mixing business with leisure through social networking sites is a risky game. Earlier this year a Tory activist was expelled by his party for boasting on Facebook about dressing up as Madeleine McCann at a fancy dress party where another guest went as Baby P.
If businesses use Twitter they will be faced with major security challenges.
Security supplier Network Box last week released a guide for businesses to help IT managers create user policies and update security processes to include Twitter and other microblogs.
Simon Heron, internet security analyst at Network Box, said, "The most important thing is that a company's security systems work for, not against, what employees need to do their jobs. Our advice is: make sure your security is up to date so it can deal with new technologies such as Twitter."