Is Snapchat Really A Social Media

Is a social media network really a social media network if it does not have advertisements? Facebook and Twitter are two popular social media sites that are known by their users for the pesky advertisements that pop up on the sides of their screen and even in a user's newsfeed as if it was something posted by someone they follow. Although Snapchat is different in the sense that a user sends a picture and it goes away in seconds instead of publishing a post that lasts forever, Snapchat is still a form of social media and is now finding their way to implement advertisements, in the form of geofilters, in their mobile app for major brands.
At first Snapchat was advertisement-free, but now Snapchat has started using geofilters, or "ad images