The Brief: A person's "real" Instagram account, not to be confused with their "fake" Instagram account, called a finsta.
“Rinsta” is a combination of the words real and Instagram. It refers to a person’s public Instagram, as opposed to their more private “fake” Instagram, called a finsta.
A rinsta is typically used for showcasing the parts of your life that you want people to see: typically more curated, edited, and polished photos and videos. On the other hand, a finsta is used for posting the photos that you might not want many people to see. A finsta is typically only accessible to a select few chosen people, and the content is much less filtered.
— Payton Chang (@paytonchang) November 5, 2017