I can't say no exactly and I can't say yes. One of our widowed cousins married a woman he met on line and it has worked very well these past four years they have been married. But both were mature Christians whose spouses had died.
I think that any kind of Internet exchange should include a great amount of caution. And I would never encourage someone moving quickly into a serious relationship with someone they had met on the Internet.
People can say anything they want and pretend to be anyone they want on the Internet. I had a bad experience with a penpal I had met on a Christian forum in that she was pretending to be someone she wasn't. And when I realized that she had lied to me over and over again it was very disheartening and this was just a friend.
I prefer the traditional way of getting acquainted, that is, face to face through church, organizations, mutual friends, work, etc. and even then with caution for those who are not married and searching.
Proverbs 12:26a "A righteous man is cautious in friendship..."
mourning dove...