Wall...???

Checked my Notifications and saw where a board member had posted to my "Wall". What is The Wall, and how does one post to it?
"If there are no dogs in Heaven, then when I die I want to go where they went." Will Rogers
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Checked my Notifications and saw where a board member had posted to my "Wall". What is The Wall, and how does one post to it?
Comments
Thanks, who knew. Change can be a scary thing for some of us old farts.