If you have viewed or shared a news story on Twitter recently there is a good chance you have seen a Twitter card. News sites are using them as part of their Twitter strategies to drive traffic to their site.
I got into 'Twitter for work' largely because I’m new to the area in which I’m working, and there are seemingly endless stakeholders interested in my policy area.
If you're a member of staff (on a contract or otherwise) at BIS, then you're subject to the Civil Service Code. There's some useful information here about how the code applies to use of social media.