She is based in London

Social entrepreneurs see problems much as economists see them: as simple inefficiencies. Sometimes, indeed, inefficiency alone is involved - for example, mushroom growers not having access to discarded coffee grounds. But in many other situations, the problem is politics, which is to say the clashing interests of people. Many social entrepreneurs treat power as something to work around. They can be clearer in articulating what they are for than in stating what they oppose, and why. They often take the holes of the system as a given and do their best to plug the leaks.

Africans are active participants in the social media industry, here are a few examples: Motribe - This South African company enables you to create your own mobile social network with speed and ease and offers you great social tools to power your mobile social network MXit - A South Africa-based mobile social network. Over 27 million registered users, adding over 40,000 every day. Check out this cool infographic about MXit Adloopz - An innovative Nigerian startup that puts a social twist to advertising on the internet Personera - Personera lets you create custom artifacts from your content on social networking sites like Facebook Nikohapa - A Kenyan startup that offers Foursquare-like checkins made simple and that reward you with discounts for checking in to partner stores Ushahidi - Crowdsources information using multiple channels including social networking platforms like Twitter  Swift River - An Ushahidi project that adds super data processing to data coming from sources of unstructured information such as a twitter feed Zoopy - Another South African company that focuses on mobile video ForgetMeNot Africa: bridges the huge gap between the internet and mobile messaging worlds allowing any mobile phone to send and receive email and chat message on any carriers network. Quirk eMarketing - A digital marketing agency that also helps companies make use of social media for great results. Quirk has also spawned other cool companies in social media such as BrandsEye that creates great tools for online reputation management and crowdsourcing company IdeaBounty. And as far as group buying is concerned, Groupon has inspired many an African groupon clone. There are numerous African companies playing in this area - Rupu and Zetu in Kenya, DealDey in Nigeria, and a whole lot of others in South Africa

Mambe Nanje is the founder of Njorku.com- a fast growing job search engine and aggregator that helps thousands of African job-seekers find employment opportunities in locations nearest to them. It's something like Google, but exclusively for African job seekers. The service went live on in late March, and within four months, Njorku is already attracting more than 5,000 unique users per week, a brilliant performance by Cameroonian standards.

Localization of an e-commerce site goes much further than just dealing with customers and payment methods. "In the US, local merchants are unsophisticated, you can't imagine how unsophisticated they are in the third world. With all due respect, it's rough. You're not dealing with the most cutting edge people in the world. They're old school. You have to know the dynamic of the local merchant. Every local merchant has a different psychology - how much can you push and pull, how in touch are they with new modern ways of doing business." Dealing with local merchants has been an educational experience, for all involved. Offerna has been playing a significant role in giving merchants new and dynamic ways of dealing with their customers, and in the process, building a loyal consumer base.

In looking at the world around, us, the shift that is the most apparent to many is the pace of technological change, with in the order of 100-fold increases in processing power, storage efficiency, and fixed and mobile bandwidth over the last decade. However I believe that the degree of social change over the last decade has been at least as much as that of technological change, if not more, across countries, cultures, and contexts. On the face of it, much of this social change has been driven by technology. The freer flow of information, enablement of expression and participation, ability to connect across boundaries, and rise of powerful open source technologies have helped to shape new values. Openness, transparency, authenticity, participation, opportunity are values that stem from the technologies that have dominated the last decade. Yet it could rather be that our shifting social values (or perhaps our underlying values that have long been yearning for expression) are shaping the technologies we develop.

At the end of the week, there was a business competition.The four winning companies were: Bey2ollak - An iPhone app that provides live user-generated reports of traffic conditions on the streets of Cairo. It already has more than 50,000 subscribers and a partnership with Vodafone -- one of the largest mobile phone operators in Egypt. Inkezny (translation: rescue me) - An iPhone app enabling travelers to make emergency calls in any location in the world without having to know the local emergency phone number, as well as seeing GPS directions to and phone numbers for the nearest hospitals  Crowdit - A digital collaborative storytelling platform using real-time pictures, video, and social media reports to reinvent the way stories are told and shared online SuperMama.me - The iVillage of the Middle East, creating a community of mothers designed to connect and empower the women of the Middle East/North Africa region