Twitter owns https://www.mopub.com https://www.mopub.com an ad exchange too. I think its one of the bigger ones. Ad exchanges are the things that provide rev

Twitter owns https://www.mopub.com https://www.mopub.com an ad exchange too. I think its one of the bigger ones. Ad exchanges are the things that provide revenue to app devs. Basically, when you open a free(mium) app there is a market bidding for the right to show you an ads. There is all kinds of tech trying to characterize you based on your phone's id so you see relevant ads. Having an audience of 320+ million people and ad tech powering a significant portion of the app world seems like nice problems to have.