Social Media moves so fast, it’s hard to keep up. Here’s the week’s top Social stories, in scan-friendly format.   This Week: TwitterWorth US$250m, Gets US$20m Injection Digg Restructures to Find Profits: Poaches Yahoo! Exec. Facebook Rolls Out Ad-Driven Polls Ad Network Social Media Bags US$6m Superbowl Advertising, Web 2.0-Style The Greatest Superbowl Snack Stadium Ever  

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