hi there Dominikus, i would suggest you look at ways of placing this experiment more efficient rather then just by social networking sites, Maybe you could speak to small shop owners to see what they think of the idea. if they like the idea maybe think of a way of seeing if this experiment really works, by placing a "food donation box" So while people do their shopping they would pick up a item they would want to be sent to rural parts of Africa and donate it to the box.
Good concept you have there, however in most rural countries most woman have more then 3 children. think of a way to provide for families who do not live on 2 dollars a day. Maybe a book on ways people can do these specialties at their home with different ingredients?
Interesting idea. However another way of spreading knowledge in rural areas in Tanzania is by speaking to the community leaders of the villages. Also from studying a bit about Tanzania i have noticed that the men of the families do not have a lot of knowledge about pregnancy. If the community leaders spoke to the men of the families then the knowledge could get passed down to their wives.