Based on the aggregated intelligence of 180,000-plus investors participating in Motley Fool CAPS, the Fool's free investing community, mobile advertising solutions specialist Millenial Media (NYSE: MM) has received the dreaded one-star ranking.

With that in mind, let's take a closer look at Millenial Media's business and see what CAPS investors are saying about the stock right now.

Millenial Media facts

Headquarters (founded) Baltimore, Md. (2006)
Market Cap $1.1 billion
Industry Internet software and services
Trailing-12-Month Revenue $132.1 million
Management Co-Founder/CEO Paul Palmieri
Co-Founder/Chief Technology Officer John Brandenburg
Trailing-12-Month Operating Margin (4%)
Cash/Debt $123.5 million / $0
Competitors Apple
Google
Yahoo!

Sources: S&P Capital IQ and Motley Fool CAPS.

On CAPS, 27% of the 33 members who have rated Millenial Media believe the stock will underperform the S&P 500 going forward.

Just yesterday, one of those bears, All-Star MegaShort, touched on Millenial Media's seemingly unsustainable valuation:

At [120x] forward earnings, they are much more expensive than competitors like Google, Yahoo, Apple, etc. But unlike those companies and Facebook, they are a pure advertising company without their own content platform. That seems like a major competitive problem! [Millenial Media's] price is based on the assumption they can achieve margins comparable to elite content/advertising competitors and that is not going to happen.

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