The 3rd party content that you may see is part of Shareaholic's optional Promoted Content Monetization system. It is designed to help you monetize your website by integrating sponsored content from third party advertisers into your content recommendations.
How does Promoted Content work?
Advertisers pay to distribute content recommendations across the Shareaholic Network, which are displayed as clearly marked sponsored posts alongside Related Content from your own site. You, in turn, generate revenue from the traffic you drive to these posts while continuing to promote your own site content.