Jeff Blackburn, senior vice-president of Amazon, said: "Wikia has always had the vision that users get great satisfaction developing communities and socializing around the things they love."

The C round is also co-led by venture firms Wellington Partners and Agate Medical Investments as well as medical device entrepreneurs.

As part of the equity investment, 3M has formed a strategic development to bring a new class of displays to market that foster visual collaboration.

Investment in Nasuni now totals $43m for the three rounds.

In March, Itochu bought a stake in Zeachem for an undisclosed sum and now adds to its C round.