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DEMO, the twice annual "launchpad for emerging technologies" that debuted massively successful technology products and services including TiVo, E*TRADE, Salesforce.com, VMware, Six Apart, OddPost, IronPort, GrandCentral and Glam Media, returns on March 1-3 with a new crop of web startups and products.

David Spark discussed some of the biggest mistakes made by social media gurus, from writing on your own Facebook wall to hiring voice talent for podcasts. Think you know what you're doing every time you engage in social media? Neither do I, and neither do the social media gurus I spoke to about their biggest social networking blunders. In an effort to learn from others' mistakes, here's a list of some all star errors in judgment from some social media all stars. I'll lead off the order by admitting an error of my own.

Signal (in private beta) is "quick and easy photojournalism" where users capture media that they upload to the mobile app with a short caption. Described as an Instagram-meets-Reddit system for breaking stories.

Mashable has partnered with Twestival to promote the world's largest Twitter fundraising drive. Here, New York Twestival co-organizer Paull Young promotes a call to action on the eve of the event.

Whether you're just starting out or have been coding for years, here are over 130 new tools to make you a better and faster Web designer.

Renren