A common 'reaction status' is seen after a popular TV show, when people post funny lines from the show knowing that people will be logging into Facebook shortly afterwards.
"Remember when everyone used to have a Nokia 3310?" (The person posting this knows everyone had a 3310. They said so in their post. So why ask? Reaction Status.)
*any line from The Inbetweeners* (People posting these know large numbers of people watch The Inbetweeners, and often actually race to be the first to post a funny line, in order to secure the most comments/likes. Reaction Status.)