Damn reaction limit
Venus is for Mila so she can earn a lot of mony by jiggling her watermelons.
Aurora for two purposes. First, here the MC will be looking for people from the past.
Second, remember those complicated and incomprehendable explanations Ocean had about how the game world worked in his head? The main conclusion that can be drawn is that there are a lot of things going on in the background that the MC is not even aware of. But his actions affect this invisible background scene, and events happening in the background affect the outcome of the MC's actions. My guess that Aurora will be essential tool for the MC to introspect that background scene and gain a better understanding of what is happening around him, such as what Marla and Vic were talking about and why he found Marla crying in class. Or why this group of strange girls are staring at him and who the hell they are.
And after all, it’s just fun to read the chats of characters on a social network, it adds depth to the game world. At least I like reading comments on Rooster, you know where. It reflects the real world in which we now live; instant messengers and social networks are as natural to us as letters were to our great-grandmothers.