http://iag.me/socialmedia/reviews/7-reasons-not-to-use-hootsuite/
http://fortune.com/2016/02/17/social-media-management-sprout-social/
http://iag.me/socialmedia/top-5-social-media-management-tools/
This links is about all these types of social media management software.. I take from it the top 3 all have $1 billion valuations & all offer something a little different, SM management is big business for businesses and they pay upto $3k a month to use such a service.