Welcome @PamUg. About this site, these days it's being reactivated and updated after a long time, now finishing the migration to current web technologies. The site and community were needing it because they started in 1996.
On what you mention—social work in Africa and like minded people—in the World: Africa category there are for now just 168 old posts on South Africa, Uganda, volunteering (social and environmental), etc. Maybe some could be useful for you.
If for example searching for some specific information, you can post there or on other sections such as Solidarity (nonprofit jobs, etc.), so that people or ourselves can help a bit in your research or interest.