Scoop.it is a service that allows people to curate their own private lists of content from around the web. Other people can then follow these lists and read the suggestions of their owners. Scoop.it has many big lists in every niche.
To promote your content on Scoop.it, you will want to submit it to the top 25-50 lists in your niche. If the owner approves the article it will be published for all the followers to see and can generate a flood of traffic. Remember, your content needs to be epic and relevant to be approved for sites like this.