Why It’s Hard To Say Which Mobile Ad Network Is The Largest

Golden Compass Mobile Ad

Advertisers want to know how many people they can reach before they commit to a multi-million campaign. But in the mobile industry, determining the size of the audience is still difficult, if not impossible — especially among the dozen-or-so mobile ad networks.

In an effort to resolve this, Nielsen has reluctantly released a list of the six largest mobile ad networks in the U.S. However, in a strange twist, the research firm warns Mobile Marketer, which first reported the results, that it cannot stand by the report’s accuracy — because it’s so hard to tally a network’s true reach.

With that caveat in mind, Nielsen says the top U.S. mobile ad networks in terms of monthly unique visitors are:

1. Millennial Media: 45.6 million
2. AOL/Platform-A

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