British intelligence agencies have the capacity to monitor social media sites such as Facebook and YouTube by tapping into the cables carrying the world's internet traffic, according to documents obtained by NBC News.
The documents, reportedly taken from the US National Security Agency by whistleblower Edward Snowden, show British spies demonstrated a pilot programme to their US counterparts in 2012.
The programme, called "Squeaky Dolphin", was able to monitor YouTube in real time, collect addresses and some other user information.
According to the “Psychology A New Kind of SIGDEV [Signals Development] presentation, the Government was also able to take part in “broad real-time monitoring of online activity” of URLs “liked” on Facebook, Blogspot/Blogger visits and Twitter.
More top news
Net migration to Britain was down 49,000 in the year to September 2016, the lowest level in more than two years.
Special forces say they have attacked a sprawling site adjacent to the city's airport in a bid to liberate the area from IS.
Flights and trains were cancelled or delayed and drivers were warned to steer clear of some main roads as winds of nearly 90mph hit.