The Royal Bank of Scotland has signed up for Facebook At Work, the social network’s office version. RBS is the first bank to opt for the network, and is the biggest company signed up so far. The bank’s employees can now use all the normal Facebook features, but their professional profiles will be separate from their private accounts. The information shared between its employees will only be accessible to other people within the bank. RBS said it will roll out the service to around 30,000 of its employees by March 2016 and hopes all of its 100,000 staff will be using it by the end of the year.