MIT graduate Drew Houston co-founded Dropbox back in 2006 when he got tired of keeping track of his USB flash drive. He knew there must be a faster, more convenient and safer way of not just storing data but also sharing it. Today Dropbox is one of the hottest tech start-ups around and is going from strength to strength so much that tech giants such as IBM and Google are playing catch up.

Below is an infographic looking at how they have grown and expanded in a mere 6 years from just 2 employees to 200 and over 50 million users, all on word of mouth advertising!