A handful of Instagram users are reportedly seeing banner ads for a "One tap photo messaging" app called "Bolt", according to The Verge's Ellis Hamburger. Some thinkls thats it an accidently post by Facebook through Instagram.

Confused Instagram users have uploaded screenshots of the Bolt advertisement to Twitter, but no one has been able to  download the app, as the "Free" download link doesn't working.

We have reached out to Instagram for comment.