My initial thoughts are that it would be tough to deliver on... and of course, you run the risk of posting something that the company doesn't like, so there may be legal issues you'd have to deal with.

There are offliners that do this, though, so I'd be interested to hear how they deal with these issues.

I think it would be a great place to start. "Online reputation management" is the phrase everyone throws around now for a service that has been born recently from the emergence of social media and the internet. Most business owners think there is more work involved with updating FB, Twitter, Pinterest etc. than there actually is, so you could charge them a good bit and it would be worth your time.

Another good entry level service to offer is simple web design/redesign.

If you can position yourself as a Client Retention Consultant or something similar, I think this could make you a lot of money.

Kung Fu Backlinks has a good point about posting something your client doesn't like. So you don't. And in order not to, you have to spend a lot of live time with your client. Facetime is expensive.

Your job would be to find companies with a large or potentially large follower group and talk to them about the benefits of this kind of marketing. It's well-known that the cost of getting a new customer far exceeds that of selling to an existing one. Then you ask what the average revenue per sale is...then how many repeat customers they think they would get a month...X 12...now we have a big figure to talk about, don't we? And from this we base our budget. 5%, 10%, even more is what you want.

It'd be great if you'd come back and post your insights after trying it out. I've often thought about offering social media management as a service.

[DELETED]

My advice is that you really need to be a bit cautious, because of legal issues, there are countries wherein there E.Commerce law are much rigid.