Yes, informal groups could be detrimental to an organization if employees spent more time and effort on informal group activities than they did working at their job. Some common classes of organizational norms include those that focus on effort and performance, dress, and loyalty. Norms can help an organization by providing clues as to behavioral expectations. They could hurt an organization if the norms are contradictory to what the organization's goals and expectations are. The results of Asch's conformity studies suggest that there are group norms that force group members toward conformity.
Individuals desire to be one of the group and avoid being visibly different.
The studies further generalize that when an individual's opinion of objective data differs significantly from that of others in the group, he or she feels extensive pressure to align his or her opinion to conform with those of the other group members. The most effective size for a group depends upon the focus of the outcomes. Large groups, those with twelve or more members, are good for gaining diverse input. Smaller groups are better at doing something productive with those facts. Groups of approximately seven members tend to be more effective for taking action.