This is the A2SM Link Post for April 20th through April 21st. To see more of the bookmarks we’ve found, check out our Delicious Feed.

• As Facebook’s f8 Developer Conference Approaches, a Recap of Its Rumored Launches – Facebook’s first f8 developer conference in two years is happening next Wednesday, and it will feature big announcements from the company. Here’s our look at the latest hints and rumors about what might be launched.
• Why Doesn’t Facebook Look Like This? –
• Measuring The Value Of Social Media Advertising – Nielsen and Facebook recently joined forces to develop ad effectiveness solutions to determine consumer attitudes, brand perception and purchase intent from social media advertising.
• Apple (Allegedly) Loses Prototype iPhone HD, Demands Its Return – Today, Apple is expected to announce yet another blockbuster financial quarter, with sales of its iPhone smart phone likely doubling when compared to the same quarter a year ago. But that isn't Apple's biggest news this week. Instead, the company is scrambling to undo the harm caused when one of its engineers lost a prototype iPhone HD, a device Apple is expected to announce this June. The prototype ended up in the hands of a nefarious gadget blog, which not only gleefully published photos and videos of the device but also later outed the employee who lost it.
• How Social Media Can Effect Real Social and Governmental Change – People have always used the “social media” of their time to effect change. Without belaboring history, consider that some of the most widely-felt changes in the Western world were made by “bloggers” using the technology of their day. Paul of Tarsus (St. Paul), wrote newsletters (epistles) that substantially influenced Christianity throughout the Mediterranean. Martin Luther brought church abuses to light and initiated the Protestant Reformation through his 95 updates (theses), and Thomas Paine spread his blog (printed pamphlets) about democracy to the masses in the ramp up to the American Revolution.
• 5 Unique Ways to Use Twitter for Business – Given that Twitter as a platform supports nearly limitless applications for business use, we thought it time to highlight some of the newer Twitter-for-business opportunities that aren’t so obvious.
• AT&T Unveils Buzz.com – AT&T is officially opening up its recommendation service, Buzz.com, to the public. We wrote about the project when it was still in beta in January. The service is essentially Yelp meets Yellowpages.com and it shares a lot of similarities with the new Google Places.
• Hitler "Downfall" Parodies Removed from YouTube – The movie studio responsible for the award-winning, German-Austrian film Downfall (German: Der Untergang) has asked YouTube to take down several videos from the massively popular subtitled “Hitler finds out…” meme, and the site has complied.
• Facebook Turns Off Facebook Lite – Facebook has stopped supporting its stripped-down Facebook Lite website. If you go to the old Facebook Lite address you’ll be redirected to the regular Facebook homepage.
• Government requests directed to Google and YouTube – Like other technology and communications companies, we regularly receive requests from government agencies around the world to remove content from our services, or provide information about users of our services and products. The map shows the number of requests that we received between July 1, 2009 and December 31, 2009, with certain limitations.