Britain’s largest firms have 19m Facebook fans, 1.9m followers on LinkedIn and 1.7m on Twitter.

This is according to a survey of the social media profiles of the UK’s FTSE100 companies undertaken by digital corporate communications agency The Group.

Only 12 such companies have Google+ profiles, compared to 86% who use LinkedIn.

The last six months have seen a total of 62.1m views of corporate videos of FTSE100 firms, a rise of 79% on the previous period.

The number of companies with blogs was 16, unchanged from the previous survey, and the number of blog posts fell by 45% in the last six months among these firms.

The Group managing director Cathal Smyth says: “Companies are really missing an opportunity by neglecting this channel, as it offers the FTSE100 a real opportunity to engage with stakeholders, demonstrate transparency and lead on issues.”