SlideShare,the “YouTube for presentations,” has been focusing its efforts on becoming the premier platform for professional and business content. Today, SlideShare is going freemium with the announcement of tiered, paid plans for businesses. SlideShare lets anyone share presentations and video and also serves as a social discovery platform for users to find relevant content and connect with other members who share s...

Editor’s note: Is the law of large numbers getting to Google? Innovation is hard, especially when a new idea needs to create billions of dollars in revenue for it to count. In the the following guest post, author and former venture capitalist Peter Sims talks about the challenges Google faces not to suffer the same fate as every other dominant tech company before it. Sims is co-author of True North:...

Have you been looking for a way to call your Facebook friends on your iPhone or your Android device? Haven’t figured out their numbers yet? A new solution from Vonage offers free calls to all you Facebook friends who, virally, have downloaded the same app. The calls work over WiFi and 3G/4G networks. The app, called Vonage Mobile for Facebook, is an odd, viral solution for voice communications. The app trolls...

UPDATE: Party tickets are sold out again. Last batch to be released tomorrow. Social Currency CrunchUp tickets will be sold out by Wednesday, so pick them up now. We’re releasing another 100 tickets now to our July 30 summer party at August Capital. Act fast if you want one, these things sell out in less than an hour. Before that party we’re also hosting an all day event – the Social Currency...

Guest post by Cyan Banister… I’ve met a lot of engineers and entrepreneurs from Detroit and there’s an underlying vibe that resonates from all of them: a specific attitude or work ethic – possibly left over from the automotive industry – that either causes them to try to work harder than their fathers or go against the grain trying to figure out how they can live life to its fullest. As...