The Outbrain ad system displays thumbnails and titles in grid layout after your articles. The Outbrain ad network was chosen by MacWorld.com, Cnn.com, Fortune.com, TheGuardian.com among others.
Taboola is also an ad network that works like Outbrain. It adds thumbnails and titles in a grid layout at the end of the articles. The Taboola ad network was chosen by HuffingtonPost, NBC news, The Daily Mail, BusinessInsider, CNBC, Bloomberg and slate among others.