If you are interested in social development and contributing towards organisations that do charitable work, then have a look at these two web sites (which are linked to each other),

www.greatergoodsa.co.za
www.sasix.co.za

You can use them to put you in touch with organisations that do the things that you have a particular interest in, or use the SASIX site to contribute towards specific projects.

Oh, yes, and if you contribute towards a Section 18(A) organisation, you can deduct donations from your taxable income—up to 10% of taxable income.