Twitter only has 49 black employees - out of 2,910 staff members in America.

The 35 men and 14 women account for just 1.7 per cent of the firm's US operation, which is 93.8 per cent white or Asian.

Slamming the figures, released in a compulsory Equal Employment Opportunity (EEO) report, Rev Jesse Jackson said people are 'becoming intolerant' of the stilted progress.

Lack of diversity: Just 35 men and 49 women who work at Twitter are black, new figures reveal

'Black people are greater users of the product and capable of doing the jobs, but there has not been an adequate commitment to hire, train and maintain [black people],' the civil rights leader, who is spearheading calls for diversity in tech, told The Guardian.

The number of Hispanic employees also fails to reflect the proportion of Latino users, and of America's Latino population.

Twenty seven per cent of black adults use the site, and 25 per cent of Latinos, compared to 21 per cent of white users, according to the Pew Research Center.

Nearly one in seven Americans is Latino, and just under 15 per cent of the US population is black.

Responding to the figures and protestations last year, diversity and inclusion director Janet Van Huysse wrote a blog post promising to increase diversity.

She wrote: 'It makes good business sense that Twitter employees are representative of the vast and varied backgrounds of our users around the world.'

Outrage: The Rev Jesse Jackson, who is leading calls for diversity in tech, slammed Twitter's figures

With her pledge, some general graphs were released that showed African Americans accounted for 2 per cent of the workforce.

The firm has yet to release figures for 2015.

It comes a month after Rev Jackson slammed Google when figures revealed black people account for just 2 per cent of the tech giant's workforce.