They first become friend like this
secnd stage will be to win your confidence. That will take a year or so, After that they will ambush. There are many ways to do that and they are doing it. They will even show you their house,cars or their jobs (all fake) they will even invite you in  NIgeria for a vaccation. 

What next

1. you will be kidnaped and ask 1000 dollars to be deliverd to them by some of your relatives if women come, they will rape, take money and then only you will be free.
2. some of them will use your credit card 
3. Kill you and sell your organs

I am serious, no joke, Be aware and disconnect all links