I have seen many West African women who are actually men posing as women and trying to lure men on dating sites. They befriend you and then with some sob story, ask you for money. They write the line "remember age, color and distance does not matter".
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They are on dating sites as well as employment sites. Basically, they have access to a large amount of lonely, desperate, and vulnerable people so they try to get money out of them. And actually, they aren't all from Africa but many claim to be because they think it will make people feel more sorry for them.
On employment sites, they run a scam where they contact job seekers and offer them an amazing job...that needs an overhead fee of course. They say you need to pay to show commitment and that they'll reimburse you. But the check they send you is counterfeit and will bounce, causing the banks to get pretty upset.1