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The business end of Twitter has revamped its website tonight and it now includes a form that companies can use to express interest in purchasing Promoted Accounts, Promoted Tweets or Promoted Trends.

Would-be advertisers are asked to select from 5 categories of monthly ad budget, ranging from below $10k through over $100k, and choose whether they would like their campaigns to begin in 1 to 4 weeks, 1 to 3 months or 3 months from now. This may be the real time web, but real-time advertisers, apparently, are still best advised to pick up the phone with credit card in hand. The ad buying page is so fresh and new that the "thank you" page you're sent to after completing the form just shows a page not found error.

For the first time ever, Android has tied with Apple's iOS platform in terms of mobile ad impressions on Millennial Media's mobile advertising network, according to its latest monthly report. Android's mobile operating system has seen rapid gains over the course of 2010, and has increased its ad requests by 2182% since January, growing at a rate of 65% month-over-month.

Android now has a 37% impression share, as does Apple's iOS, says Millennial Media.

Google Goggles, the mobile app that lets you search the Web by simply taking a picture with your smartphone, is announcing a marketing experiment today that merges offline marketing with the mobile Web.

Today on its blog, Google announced that it is working with Buick, Disney, Diageo, T-Mobile and Delta Airlines "to extend some of their ofline marketing to the mobile Web."

According to a study of over 16,000 mobile YouTube users conducted by Google, 75% of respondents said that mobile is their primary way of accessing YouTube. At first glance, that figure may come as no surprise - after all, how shocking is at that a survey of mobile users finds that they watch a lot of YouTube Mobile? However, it's actually a rather telling number.

For some of us, watching YouTube on a mobile device is an additional way to watch video, not the primary way. But as it turns out, for a large majority of mobile video users, it's completely the opposite.

An all-star team of data geeks has formed a startup aimed at automating inexpensive online advertising for small businesses. Vurve launches today with support for Shopify and Yahoo Stores, asking only two set-up questions of store owners, a $200 per month monthly ad buy and an estimated 15 minutes per week of maintenance.

Vurve says it then automatically creates ads and places them in Google, Facebook and elsewhere, with automated campaign management and analytics that show each customer's path from discovery through purchase.

Who will control mobile advertising - Apple, Google an assortment of small time players, each with their own slivers of the market? How should ads be targeted? What new advertising trends are we seeing now?

These topics are more were discussed this afternoon at the Open Mobile Summit in San Francisco by top executives from mobile ad firms and Jason Spero, Director of Google Mobile.

Facebook quietly introduced an "Unlike Page" button into its News Feed recently, which allows users to opt-out of receiving unwanted messages from pages they had previously said they "liked."

Now, when a user clicks the "X" button to remove a story from their News Feed, there's an option to unlike the page, which joins other options including "mark as spam, "hide this post," or "hide all" posts from the offending page.

For a while now, Google has allowed select mobile advertisers to add their phone number to AdWord text ads so that customers can just click on the number and place a call. Until now, though, it was hard to track how well these ads really performed, as Google didn't give advertisers a convenient way to track these calls. To remedy this, Google is launching AdWords Call Metrics today with a limited set of U.S.-based advertisers. The company plans to open this beta up to more advertisers in the coming months.

Any doubts that mobile advertising is big business should be crushed by the most recent research from Informa Telecoms & Media which found that mobile ad revenue will reach $3.5 billion worldwide this year.

What's more, by 2015, revenue will have increased eight-fold to around $24 billion, thanks in part to efforts from Apple and Google, namely, says Informa.

According to a number of analysts, the cumulative mobile advertising revenues in Europe's five largest economies (France, Germany, Italy, Spain and the U.K.) will top $1 billion in 2015. On its way to this, as a new whitepaper from mobile ad optimization and advertising firm Smaato points out, Europe faces a number of unique challenges. As the report's author, mobileSQUARED's chief analyst Nick Lane notes, the upcoming 2012 London Olympics will be a catalyst for driving total mobile advertising revenues in these countries beyond the $1 billion mark.