What are the most common reasons for Customers to hit the Unfollow button on the Company's Social Media Page?

There can be multiple reasons, but the most common of all is when marketers take company/brand social profile as a broadcast medium. Too much push of content in less time can lead to spamming on user fb wall. The other reason can be push of content not related to company/brand/cause. Eg. a car tyre brand pushing out content talking about dog food ... When you create a social profile, you build up a virtual community of like minded people. If the page talks differently then there will be people leaving the community ( in this case unfollowing a page). 

Also, one important trade of a good social media page is user engagement, acknowledge user on his/her comments/messages. Let them know there is a human behind a brand and your page is not just a broadcast medium. 

Hope this helps! 

- No useful updates from the company's social media page.

- Un trusted information taken from the company.

It is a question of knowing of culture and tradition.