Facebook has reached 100 million active users in Africa.

Reports suggest that around 80% of the users are accessing the site via mobile devices, which might be triggered by Internet.org app in Zambia that allowed users to access Facebook and some partnering sites for free.

The new market is expected to bring new advertising opportunity for Facebook with currently 30% of its global advertising revenue come from Europe and Middle East and Africa region accounts.

In the second quarter of 2014 Facebook’s global mobile advertising revenue grew to more than 150% which accounted for about 62% of overall ad revenue.

Facebook’s vice president for Europe, Middle East and Africa Nicola Mendelsohn said: "There is a fantastic opportunity for business as well if you are local or a global business."

"Knowing that there is all these people now in Africa that you can connect with, that is exciting as well."

Facebook has been customising products to suit the requirement of individual countries and in a country like Africa it can now target users for advertising based on their internet speed.