As the owner/operator of a one man marketing consulting agency, off-site SEO and social media updates were sucking up a disproportionate amount of my time. I contacted On The Maps and now outsource that part of my business.
They offer a White Label dashboard for my clients to be able to keep track of their progress, have incredible customer service, and all of my clients who use this service are on page one of Google in their preferred keywords. The best part is that their fees are very reasonable - far less than I have ever quoted my clients for the same service, so I am able to give my clients a discount, they get a better quality of service, and I am able to make a respectable profit without the hassle.
If you are a marketing agency looking for a white label SEO option, I cannot recommend On The Maps highly enough.