It is more convenient than email if you don't have someone's email address.
I'm no fanatical Facebook user but I have found people on there that I had lost contact with years ago.
please explain the logic in posting a message to a site which sends an email to the recipient telling them to log onto said site to read it
When someone sends you a message on Facebook the email from Facebook contains that message so you don't have to log in. There are some things where it emails you and tells you to log in for more info but messages from friends is not one of them.
Slashdot Mirror
"The only purely rational stance to take in the total absence of proof or disproof of God is agnosticism"
Does that logic also apply to Unicorns, Pixies, Fairies etc? Are you agnostic about Hobbits for example?
It's no more convenient than email
It is more convenient than email if you don't have someone's email address. I'm no fanatical Facebook user but I have found people on there that I had lost contact with years ago.
please explain the logic in posting a message to a site which sends an email to the recipient telling them to log onto said site to read it
When someone sends you a message on Facebook the email from Facebook contains that message so you don't have to log in. There are some things where it emails you and tells you to log in for more info but messages from friends is not one of them.