When someone says social media, you probably don't immediately think of LinkedIn. But there's no denying that the business networking site has gone the distance: it is now 20 years since it was founded in Silicon Valley.
It was the brainchild of Reid Hoffman, a U.S. entrepreneur who worked on an early social media platform for Apple before launching one of his own in 1997. SocialNet was a dating and professional connections site, but folded two years later after failing to find a big enough userbase in those early days of the web.
