More than half of reporters say they couldn't do their job without social media, according to the annual "Global Social Journalism Study" from Cision and Canterbury Christ Church University, the British institution with more than 20K students.

Two-thirds of journalists surveyed in the US, UK, Germany, Sweden, Finland and Australia spend up to two hours a day on social media, up from 38 percent in 2012. Twitter and Facebook rank as the top platforms.

American and British media pros rely on social media for publishing and promoting their content, while reporters in the other countries use it for sourcing.

Nearly six-in-ten (58 percent) of the polled US journalists expressed concern over data security and privacy.

"This data confirms the mission-critical nature of social media and its ever-growing popularity for journalism,” said Valerie Lopez, Cision's VP for media research.

The study also showed that PR pros are relying more on social media to interact with reporters.

American reporters consider PR contacts their second best source of information, after No. 1 experts.

Journalists rate email (84 percent) as their best form of contact, following by social media (33 percent) and telephone (15 percent).