The microblogging social network Tumblr is struggling, according to research by Emarketer.
23 million Americans currently use Tumblr, equivalent to 13% of social media users in the US.
This is far less than competitors Facebook, Instagram, Twitter and Pinterest, which have 163 million, 89 million, 57 million and 55 million US users respectively.
It is also predicted to see very low levels of growth over the next 4 years, compared to other social networks.
In 2020, Tumblr is expected to see just a 4% increase in user numbers compared to the previous year, with the other social networks expected to gain millions more extra users than Tumblr.Â
