The social media site with the most important photo of you on it (and what you'll want to review):
Bottom Line: If you answered LinkedIn - you'd be correct. It's your first professional impression after all. So getting that LinkedIn profile pic right mattes. What that means can be complicated however. Researchers from Columbia looked into the effectiveness of LinkedIn profile pics and had interesting findings. Among them...The professionals with the least effect profile pics...ironically enough - Photographers!
There isn't any universally "right" answer. Instead you should likely run it by those who you trust in your industry that might be decision makers. It could make or break your next business opportunity or career advancement. We're all familiar with how important first impressions tend to be.