In fact, they won’t bother to stand and walk up to a colleague but rather use the phone to interact. Additionally, they won’t concentrate on their assigned task(s) but rather chat, email and interact on social media which kills away precious time. A little of these is good for taking a break but spending too much time on them will affect your work performance and productivity.
Communication and interaction with other people at the office suffers and if it catches the eyes of the Boss, the person having fun on the web seriously jeopardizes himself/herself and their reputation. There is every possibility they will be laid off when it is time for the office to downsize its employees.