Well, at least most of you aren't. 

I come across self-proclaimed experts often and am always curious at the description because, to me, it means you no longer view yourself as needing to learn.  How can that be?  Innovation occurs, new understanding emerges, and lessons are learned. Labeling yourself an expert or including such a label in your bio should be reserved for those (few) who really are. 

Meaning…you are not a social media "expert."

I would suggest viewing yourself as a student focused on continual learning where you approach mastery but never get there.  Once you feel you've arrived, you will become stale and will be quickly passed by.  Malcolm Gladwell's book Outliers espouses the "10,000 Hour Rule" where that much time is required for mastery…essentially 10 years of doing something.  I think that concept has merit…but it does not make you an expert.

For added context, let's look at what "experts" thought in the past:

• The planets revolved around the earth (the geocentric model)
• The world was flat and you will sail right off the edge
• 'There is a world market for maybe five computers' (Thomas Watson, IBM Chairman, 1943)
• '640k should be enough for anybody' (Bill Gates, founder of Microsoft, 1981)