In your opinion, can a leader maintain a personal friendship with some members of his/her work group or team without creating the perception of in-groups in his/her work unit? Explain!

In your opinion, can a leader maintain a personal friendship with some members of his/her work group or team without creating the perception of in-groups in his/her work unit? Explain!
What should a leader do to dispel any notion or misconception that there are in-groups and out-groups in his/her work unit?
What do you say to those who argue that tactics used by followers to get noticed by their leader (such as impressions management, ingratiation, and self-promotion) are shameful and self-serving and should be avoided?
As a leader, how would you motivate the alienated follower?