To me it feels very different because irl online I am even less sure that they noticed me, whereas irl I can say "Hi" and if he just looks at me weird or walks away repeat the "Hi", online I throw the hi out and it's much easier to imagine the person is busy and hasn't noticed me because there's nothing I can do to reassure if that is case and reaffirm my initial message (I hope this was comprehensible)
No problem, Anwynn, that's what friends are for!