Africans are Fraudsters?

So today after lectures, I went to the computer lab to do some bits of adjustment to my blog (folaenifeni.wordpress.com). It's something I have to write every week, as it part of my Journalism course.
Anyways, I went into the lab and I overhead a conversation between two Asians and a White guy. The Asian guy said he got an unknown call from Ghana. The others guys laughed, and immediately suggested it's a scam attempt. One asked 'did he ask for money'
I was immediately baffled, well maybe not baffled exactly. I know we have kinda garnered that reputation, but I was miffed! Outside Africa, Africans are rarely commended for anything. The world knows Africans as poor desperate people who haven't contributed a dime to the world's development.
Although, this perception of Africans is not altogether a lie. It is true that there are some who will rather make their money fraudulently, than not at all but trust me every country has its fair share of fraudsters!