“Keep in touch” is a B1 level phrase that candidates can use in their B2 First exam. It means to continue to communicate with someone, for example by email, telephone or social media.
Social media makes it much easier to (2)…… in touch with friends
Examiner: “How do you usually keep in touch with friends?”
Candidate: “I occasionally keep in touch with friends using email, but most of the time I just use the telephone or send messages. “