poster
//ˈpoʊ.stər//
Noun
posterSingular
postersPlural
1
A large printed picture, photograph, or notice used for decoration or advertisement, typically displayed on a wall or in a public place.
She put a poster of her favorite band on her bedroom wall.
2
A person who posts messages or content on an online forum or social media platform.
The original poster asked a question about the new software.