Aloha !
Partly yes, partly no.
Yes because when you talk to someone about more then 2 hours a day on MSN, and that goes on for weeks, and you never have a silent or dull moment, you know both of you share the same interests. You've got two options, become very good friends, like what happened between me and Thierry (no we're not in love.

) Or you can fall in love. Bút, it needs to be confirmed, so after you've met that particular person in real life and you know your "digital" feelings are right you fell in love with someone on the internet. That has happened to me twice. The first time didn't end so lucky, the second time didn't end at all.
No, because like Richie says, you need interaction, and when you say I love you to someone you've never met that goes a bit far. Though I know someone who could possibly say that about his girl he met thru the internet too.

Oh and no not me.
Salaam Aleikum,
Sebastiaan