I’m placing this one as a sixth on a list of five as it’s probably the most frequently mentioned ad networks that works with all ranges of clinical, health, supplements, and other types of filtered content. The primary reason, which you can see if you visit their site, is that they shut down. They were operating through processing final bills, but as of July 31st of 2017, they ceased accepting new advertisers or publishers and have been slowly killing off their platform. It’s disheartening to grasp that one of the larger, older ad networks has died, but such is the style of brands online. You never know when profitability simply ceases to keep up a platform.