Who should set up and maintain my company's social media accounts?

Don't hand this over to an agency, ideally you should be on top of your social media platform managing it yourself

Delegate this job to an emplyee preferably within your business or with a strict commitment to (& thorough knowledge of) your business, who has (most of) these traits/qualities/skills:

- Keen user of social media

- Has knowledge of how social media features work

- Articulate & error-free written communication skills

- Great informal & formal writing skills

- Creative, sociable, nice, engaged, motivating, follow-up socializing skills

- Received some training or did his own (proven study) on social media best practices

- Has calm but decsicive manner in replying to offensive content

Your marketing team or in case of personal business the owner

I can recommend you a tech company.