While 14.1 percent of the overall UK population used Twitter in 2012, almost double (25.8 percent) are expected to use Twitter monthly by 2018.

The eMarketer has explored UK Twitter user growth and share by age. According to the study, the oldest age groups are projected to be the fastest growing. Those in the 55 to 64 age bracket and the 65+ age group saw a triple-digit growth from 2011 to 2012 (115.1 percent and 139.9 percent, respectively), and will see steady, double-digit growth until 2018.

Meanwhile, the 18-to 34-year-old age group represents the highest share of Twitter users in the UK from 2012 to 2018, with 18 to 26 percent growth during that period. Over time, the oldest and youngest groups are expected to steal only slivers of share from the 18-to 34-year-olds.

World Newsmedia Network has published Global Digital Media Trendbook each year since 2006. The 2014 trendbook contains 500 data sets and 230 pages of analysis about digital media usage and revenue patterns, including this data set. To download the GDMT free executive summary, go to www.wnmn.org