Baby boomers drive Facebook and Twitter growth It also found that total time spent online increased last year to an average of almost 17 hours per week, compared to 15 hours in 2011. The continuing smartphone and tablet boom helped the rise, with more Britons able to get online on the move. Smartphone ownership rose to 54 per cent, up from 44 per cent in the same survey in 2011. Despite growing internet and social network use, Britons are now less likely to trust what they read on Facebook or Twitter, Ofcom found, after a year in which controversies such the fallout from the Jimmy Savile scandal put the spotlight on information spread online. Some 43 per cent diagreed that they could trust what they read on social networks, compared to 35 per cent a year earlier. Despite growing awareness of the risks online, Ofcom said most Britons were still exposing themselves to increased threat of fraud by reusing passwords across multiple services online. Most use the same password for most, if not all, websites, it found.