On-line dating is rather hazardous and exposed to pranksters, trolls and fraudsters of all kinds, hiding behind anonymity and playing with illusions and imaginations of various users, looking for a friend - or more. Many are giving too much info about private data, photos, etc., which can make them vulnerable to attacks and identity theft.
Try to "play it safe" with on-line friendships and stick rather with groups of friends you know already well enough, and rather ask for a second or third advice, if you are not sure.
Your on-line friend might also worry to meet the wrong person, or she might have already a friend or even her own family in real life.
Furthermore, mentalities and cultures might be also an obstacle. Virtual relationships seem to offer a great many opportunities, but also a considerable number of "crash landings", as reality looks a bit different. Take your time and try to know your old and new friends by communicating with them.
And remember, both genders of all ages are exposed:
http://www.independent.co.uk/life-style/10-ways-to-avoid-falling-victim-to-online-dating-predators-dangers-safety-a6915301.html
http://www.healthguidance.org/entry/10180/1/Dangers-of-Online-Dating.html