AOL says it has begun selling television ads through its programmatic video exchange, Adap.tv as it looks to take a bite out of the $68.5 billion dollar television advertising pie. But there’s only one issue: the company won’t say which networks they’re working with. Problems sourcing inventory have plagued other digital ad-tech companies,such as Google, which tried,to get into the TV game late last decade. So AOL’s vague description of its partners , it says Adap.tv buyers can reach nearly 100 cable networks but won’t say which ones.