Facebook is holding its Developer Conference on April 30th, there is speculation that the social media network will use that opportunity to introduce its own mobile Ad network. This move would allow developers and publishers to use Facebook's data to better target ads. And Facebook gets a slice of the pie even when its users are on a non-Facebook mobile site.

Back in January, we told you that Facebook was testing its own mobile ad network, to post ads on free third party apps. With all of the information that Facebook has on you, it can serve up some tasty, relevant ads that are perfectly suited for you.

Originally, Facebook gave a wide berth to the idea of starting a mobile ad network, because it had no mobile ads to put on other sites. But when you consider that the company generated $1.24 billion in revenue from mobile ads over the final quarter of last year, it sure sounds like it can deliver and network a large number of mobile spots.

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Twitter has now started to support emoji in tweets and replacing them with its own custom emoji on the web that can be viewed regardless of the platform or the browser. For example, currently both Windows (7 and 8) and OS X can display emoji in their default browser (IE and Safari, respectively) but not in other browsers such as Chrome or Firefox. Also, If your browser does not natively support emoji, you will see Twitter's custom emoji instead.

Twitter is using images instead of actual emoji, which are text based characters. Because of this, any browser can display them regardless of the platform. This is only for Twitter web, however, so if you’re on a mobile platform that does not support emoji (such as pre-Jelly Bean Android) then you will continue to see empty squares in tweets. Also, the Twitter emoji don’t work if you embed the tweet.

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