I'm a huge fan of Neil Patel, huge (I'm a proud owner of a signed copy of his latest book) and I'm glad he's put Quuu as the first tool on the list. It's amazing.
When we've had content accepted by their editorial team, it's been a great driver of traffic and traffic that stuck (with good dwell times and low bounce).
The rest are great too, and if you want a 10th, I'd suggest Zest.is which a chrome plugin.
Quuu Promote is a unique and effective content promotion tool that should be a go-to for your content promotion strategy. It works by sharing your content marketing pieces on Facebook, Twitter, LinkedIn, and Google+ with Quuu Promote users. You load your content into the tool, and Quuu will share it with real people in your niche.