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You would think that a company with 423 million monthly active mobile users would find a way to squeeze some revenue out of them. Easier said than done. The biggest question to come out of Facebook's S-1 filing for its IPO was how the company could monetize its robust mobile app ecosystem. How will Facebook do it? Stitching in mobile banner ads is not likely a solution for Facebook. We explore Facebook's opportunities and ask for your opinion in this week's ReadWriteMobile poll.

The mobile advertising industry was a $1 billion business in 2011. It is expected to hit $6.5 billion by 2014, according to eMarketer. For reference, it was 1998 when Web advertising hit the $1 billion mark. In 2010, it was a $26 billion industry fueling the growth of companies like Google and other Web-centric properties.

What does this mean to you, the mobile app developer? Well, there is opportunity in front of you that is not correlated to paid downloads or in-app purchases. Mobile targeting platform Jumptap's MobileSTAT report for January 2012 shows that the mobile Web and native apps are a 50/50 market. Where does your focus go? Jumptap recommends taking a look at your target audience.

App discoverability is one of the biggest problems facing mobile publishers these days. That is especially true for HTML5 developers publishing apps to the mobile Web. A San Francisco-based startup wants to help. Appstores.com today is announcing the launch of a mobile app distribution network to help developers make their apps more discoverable and profitable.

Mobile advertising platform Nexage is releasing a private exchange to enable premium publishers and developers to optimize advertising that best fits their businesses. Nexage believes it can help premium publishers make the most money off their mobile apps and games and by taking first-party publishing data and making it available to advertisers to help broaden the targeting and reach of its real-time-bidding platform.

Nexage's private exchange is about monetizing app data straight from the publisher. The company's goal is to make advertising the dominant form of application monetization by the end of 2012. Yet, Nexage is only shooting for the large publishers (it has Rovio's business for ads in Angry Birds) meaning that the app publisher middle class will not be able to benefit from Nexage's private exchange.

Yesterday, WordPress announced WordAds, a program for hosted WordPress.com blogs to make some money off their sites. The first ads will come from the WordPress partnership with Federated Media announced at Web 2.0 this October. Interested users must apply to join WordAds, and it requires a custom domain, a service for which WordPress charges.

In return, WordPress is offering independent publishers a chance to make money on the WordPress platform. WordPress already provides a healthy living for thousands of self-employed developers, and now publishers have a chance to earn money from their WordPress content, too.

Mobile ad optimizing network Smaato has released its third quarter metrics and the good news for developers is that U.S. fill rates have stabilized. The problem for developers is that fill rates have stabilized at 18%, a one-point drop from the second quarter. The question that developers have to ask themselves is whether or not mobile advertising can be relied upon to create a viable business for their products.

Mobile ad network Tapjoy is in the process of changing itself from a business-to-business company to a consumer application discovery tool. In that vein, the company announced this morning that it is partnering with PapayaMobile to create a social marketplace for apps that will allow users to see what the popular Android games based on what their friends are playing.

Essentially, it is the merging of two SDKs -- the PapayaMobile social community mixed Tapjoy's in-app marketplace. The idea is to create higher engagement levels so Tapjoy can target more relevant ads at users and developers can increase their bottom lines.

Getting paid as a developer is often a cumbersome process. The various app stores often take 30 to 60 days or more to pay developers and advertising generally works on a 90-day schedule. For developers who are just trying to work through the day-to-day grind, the payment schedule can be a major problem.

Mobile ad platform Velti Mobclix feels like it can help. Mobclix is speeding up its payment process to cycles of 15 and 30 days in hopes of attracting developers to use the platform over competing advertising exchanges. With mobile advertising revenue growing, any way to differentiate from the pack could be advantageous.

A new tool is coming for advertisers that want to create rich media ads for the mobile Web and native applications. Celtra, an ad creation platform out of Cambridge, Mass., is announcing new price structures through two new features to its platform to create animated banner ads and single page expandable ads that are aimed to increase mobile ad engagement. The notion is to lower the barrier for entry for advertisers and publishers to create rich media ads for mobile.

The philosophy behind mobile ads is changing. The idea is to move away from drop down and static banner ads and create more rich media and interstitial ads that users are more likely to find enticing and harder to avoid. Celtra wants to lead the third-party charge in creating those kinds of ads, but it is swimming in deep waters. There are a variety of companies that are aiming at the same goal. Celtra is hoping that with its new pricing structure it can be the leader in bringing these solutions to the masses.

Mobile marketing company Tapjoy has been busy of late. One product the Tapjoy team has been looking forward to is the rollout of their mobile video advertising platform which has been in the works for most of the summer. Today, the announced Tapjoy Videos designed to provide mobile advertisers with the brand building power found on the Web and TV.

The future of mobile advertisements is going to be video. It is a tricky problem to institute but the value of video within apps and the mobile Web far outweighs mobile banner ads. Tapjoy thinks it can be the leader in this growing industry segment but does the new video product have the chops?