There are numerous key performance indicators like number of Active Followers, Demographics and Location, Likes and Shares, Comments, mentions, Traffic Data, Social Connections, Video/SlideShare Views, etc. that you should identify to determine the reach and engagement of the company on Social Platforms. By tracking the right KPI’s, your company will be able to make adjustments to your social media strategy and budget. You can mention some of the above mentioned KPIs which you feel are important from your point of view.