Once they've reached a certain age, some people completely lose their filter (if they ever had one to begin with). Old people have survived too much to be reprimanded for saying the wrong thing at the wrong time, and when it comes to social media, they are often posting the wrong thing in the wrong place.
The subreddit OldPeopleFacebook collects the most hilariously awkward, brutally honest posts from grandparents on the internet, and these posts contain Too Much Information for the newsfeed—and almost always the wrong emoji.