I used to try and post to our page myself until I realized two things a year ago:
1-I didn't have a clue what I was doing
2-I was posting so infrequently that my posts didn't do any good
I signed up with Optimize Social Media and the results have been fantastic! They usually post something to Facebook & Twitter everyday and I don't have to worry about it. I have my own contact person and can call and e-mail if I want something specific posted. I also get weekly statistics and every couple of months my contact calls and checks in. I also get a call about negative reviews, and we discuss the best way to respond publicly, and then they respond. There is a monthly fee, but I feel it has been well worth it as our page gets more likes and views everyday. Also there is a discount if you are a NAPA Autocare center.