What "illusions" do social media sites create? I don't see what this has to do with social media. Other than it makes it a bit more difficult to pull off. Because you need to make posts over the time period.
I think it's more accurately "the illusions we create within social media sites" - if someone can do this, what subtle misrepresentations are we creating (with or without thinking about it)? Certainly, it is not unique to "social media sites", but an attribute of social interaction in general. Social sites just reify and persist that interaction in a form suitable for this kind of a project.
Also fascinating how hostile some of the commenters are here. The project explores the illusion social media sites create. I think it's pretty cool.