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These people are using Facebook with the expectation it works like email. Why do you feel the two are so different? In my experience, the average computer user doesn't like fiddling with email addresses - Facebook is far more friendly (opportunity for a new email client?).

Email is not immune to these issues, either. This scenario is the equivalent to sending an email and having it end up in your friend's spam folder (although arguably Facebook should be more heavily invested in getting this right!)

As someone who just planned and had a bachelor party for my friend, I agree. Yes, I used Facebook to organize the trip and distribute information through a private event. But if someone was not responding on Facebook, I followed up with a private message, then a text, then a call if necessary.

I agree with you. However, this was an invitation from the friend's sister, who I am not friends with (even on Facebook) and who was planning the party in secret. So Facebook was her only means of contacting me.