A Frenchman who police say hacked Twitter accounts belonging to US President Barack Obama and celebrities could face jail.

The unemployed 25-year-old was arrested on Tuesday after an operation lasting several months, conducted by French police with agents from the FBI.

The 25-year-old is said to have hacked into the micro-blogging website, by simply guessing users' passwords.

The suspect reportedly targeted other celebrities, including Britney Spears.

After being questioned by police, ...