NORTH Korea's foray into Twitter has prompted a game of cat-and-mouse with the South, as authorities in Seoul battle to stop their citizens following links to Pyongyang's propaganda website.

The North has used its Twitter feed to post links to anti-Seoul and anti-US statements on its Uriminzokkiri website.

Seoul has blocked access to the site but the North has started putting other addresses on its Twitter page. South Korea bans unauthorised communication with North Koreans and offenders can be jailed.