Business presentation on social media sites does not really have to be done by the business owner, but having a team to do the posting and communicate with the followers would be more effective in generating more social media followers.
People get more interested when there are real live people they can converse with rather than just generated automated messages appearing regularly on their pages. This is basically why they call it social media because people should socialize with real people.
Remember that in the business world, you do not just sell your brand; you also sell yourself and your company. Adding a personal touch to engage with potential clients is far more effective than 100% automation.