LinkedIn reaches 225 million users as it marks its 10th birthday While many people were celebrating Cinco de Mayo this weekend, LinkedIn was marking its 10th anniversary. The professionally-focused social network became a decade old Sunday. To commemorate the occasion, LinkedIn uploaded a neat visual time line complete with pictures from the company's first office, including the translucent iMacs that were new at the time. In 2003, we were a handful of guys in a living room. Today, 3,700+ employees are celebrating 'Cinco de LinkedIn' around the world," the company said in a blog post. The social network used the occasion to announce it has more than 225 million total members. "At the end of our first month, we had 4,500 members in the network," the company's post said. Besides its visual history timeline, LinkedIn also put up a slide-show presentation showing screen shots of the website from each year, showing how the social network has evolved over the course of 10 years. In case you're wondering what other major social network will next turn 10 years old, that would be the 1-billion-member Facebook, which, will reach the double-digit birthday milestone next February. Google Glass ridiculed in hilarious 'Saturday Night Live' sketch Review: Samsung Galaxy S 4 is top notch, but disappoints [Video]