You should look forward to finding a company that operates daily. You should inquire whether their employees should work alongside them at their office or they outsource their work to other agencies. It would be imperative for you to understand who is behind your brand and how they are monitored. A social media agency outsourcing their work to a third party should be handled with utmost precaution. In such a scenario, the agency should act as an intermediate. It may be of great concern when the message articulated to the agency may not be the message received by the third party. It would result in lower quality efforts and results.
It would be in your best interest to hire an agency handling the work through their employees. Yet another consideration would be the number of accounts the potential agency can manage. It would be an important aspect to consider as not all would consider the importance of an agency managing as many accounts, as they could handle properly. You should not invest in an agency that overworks its employees. You should rest assured that an overworked employee would not be able to provide quality work. It would hamper your results and the business.