Marketing a Business in the DRC

I received this query today and I thought I'd share my reply here with you.

I'm humbled to have met you online trough our FB friend xxxx 
I've just moved to DRC and I'm trying to bring a wealth fashion concept to a marketing illiterate nation
I will be importing some fashion clothing and jewellery from Dubai and/or China to sale up here in Eastern DRC.
I have a lot of friends from this region and myself grew in South Africa. What I need to know from you is, how can I get all my facebook friends living there and abroad to talks about my business?
How can I turn to facebook to ignite a sleeping marketing to my advantage?
Or, should I say I can I best advertise my business online?