Welcome to our weekly edition of what's hot in social media news. To help you stay up-to-date with social media, here are some of the news items that caught our attention.
What's New This Week?
LinkedIn Hits 100 Million Users: There are one million new members each week on this social business platform. To celebrate this major milestone LinkedIn published the infographic below.

And here's The State of LinkedIn 2011 by Vincenzo Cosenza:

Facebook Updates Their Facebook Insights Guidelines: This is a must-read for all Facebook page admins to stay current and get the most out of Facebook Insights.

Bit.ly Announces New Mobile Site: Using shortened links now gets better for mobile users with this popular link-shortening tool.
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Retrevo Launches an E-commerce Platform: This popular consumer electronics review and shopping site now has a consumer electronics marketplace, offering full checkout and unbiased product recommendation.

Here's another social media tool worth a look.
Home Elephant: A place for people to connect with their neighbors.
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