An online friendship begins when two people bond and have things in common, just like an offline relationship. The friends may share photos, email each other, or chat on the phone eventually. The friendship can become a source of support and provide emotional benefits even though the friends will never meet in person.
More about online friends:
"Johnny? He's an online friend I talk to everyday about the Packers. I'd love to meet him one day if I ever get up to Green Bay."