Friends you chose. Employees are chosen by company designated people who would judge people for their skill and integrity towards work and company.
There is no Background verification check done on whether they are teetotalers or who are their friends’ circle or whether they maintain integrity in friendship or their relations with people where they are financially involved outside work etc…,
So be wise when you have to chose friends from your colleagues. Not all colleagues can be friends to trust with your most personal secrets or to help with finances or to rely on the most