LinkedIn is a Microsoft-owned social network that everyone uses because they think they should. Pleasure usually has nothing to do with it, and that's especially true for when you receive yet another informative (don't call it spam) email from the company. Today is a big day for the work-focused social network (if that can even be a thing). It's announcing that it now has more than 500 million members, which is fine but obviously nowhere near Facebook. That, however, is a social network you want to use because your friends are there, whereas you are on LinkedIn because you think otherwise...
Source: http://www.gsmarena.com/microsofts_linkedin_surpasses_500_million_members-news-24704.php
