I'm looking for someone to help me with content for several social media campaigns

I've a freelance social media marketer for nearly 2 years now and have decided I would like someone to help me out with the content side of things. I have a large number of clients now and with the increasing workload I'm finding it difficult to pay enough attention to everything on the adverts side of things while still producing/curating quality content each day for my clients.

Per client you role will be to:
Post a minimum of once per day to each of their social networks (Usually Facebook, Twitter, Google+ and LinkedIn)
Watch out for comments and messages and respond accordingly.

I would be starting you out on 1 client first to see how things go.

The budget is per client, per month.

Thanks.