How many mobile ad networks are there?

As from my personal point of view, the future of mobile ad networks seems more constantly growing, than ever before. Mobile Ad Networks future is very clear. For example if you were to use Ripple Ad Network, you can leverage our strength on being very strong in emerging markets. Affle's Ripple Ad Network is no doubt one of the most robust ad networks when you look at the features of reaching the right audience at the right time using the right ways.

Hi Roger,
Some brief about Ripple Ad Network

Ripple is a cross screen ad network platform, as part of the Affle group headquartered in Singapore. Ripple’s holistic approach based on
(a) audience intelligence
(b) objective based optimizations
(c) extensive ad unit portfolio has helped it deliver over 100Mn downloads of top apps on its platform. Ripple’s core strengths include:

1. Direct access to inventory through premium and long tail
   publisher/developer partnerships
2. Objective Driven Optimizations–through its robust RTB platform
   connected to leading programmatic supply sources and driven by
   our in-house ‘Optimizer’
3. Extensive ad unit portfolio including rich media, video, native and
   banner ads to maximize ROI for app downloads campaigns
4. Scale across markets on Android & iOS
5. Already integrated with leading App attribution platforms to ensure
   easy tracking on developer/marketing dashboards