A possible exception could be made for wealthy ladies who have previously traveled to your country, but these aren't generally the types of lady you'll come across in the search for a mail order bride.
Other common scams are ladies acting as affiliates of other websites.
There are some online dating sites that ban men for sending money to women they have listed.
There's some evidence of viruses being spread using chat software like MSN, Skype and QQ, so be wary of accepting downloaded files from people you meet on dating sites.
it's also worth bearing in mind that scammers are often in the Òtoo good to be trueÓ category of dating site member.
However, Nigerian dating scam (or romance scam), besides just asking for money for their studies, sick relatives, etc..
usually involves this scheme: the scammers upload fake attractive photos, in most cases of white people.