Think, for a moment, how many times you have “googled” a person or company just to get some idea about them – some initial impression about them. Your impression was made within 5 seconds based purely on sight. On sight only, you decided to learn more or move on.
That is exactly what happens when someone views your social media profiles. Potential employers, clients, customers will view your twitter, linkedin, facebook, et al profiles and in 5 seconds (or less), make a decision to contact you or move on. Keeping that in mind, be cognizant of the pictures that your post for your profile picture.
Because you never get a second chance to make a first impression.