SecondSpace (the App)

In game
An app that is either competing with, or an extension of HeartSpace, with an intended broader userbase, rather than being designed for High School students like Heartspace. It's origins, creator, and intention. were unknown, until confirmed by Macy as her own, by linking a Times 30 under 30 interview which talks about it. As such, it is probably safe to assume it had the same privacy and security issues present in HeartSpace.

Out of Game
SecondSpace is, like HeartSpace, simulated by a pair of in character channels on the Monsterhearts Fans server, with individual characters posting messages, often using personalized emotes as "profile pictures."