Hey Shaun,
I don't believe social media is the focus of this site, rather just strictly anonymous gaming. If you really do wish to send a message to a online friend there are many other methods on the internet such as via email, messengers and various other social media networks if you trust them enough to add them.
Even the chat feature in place is already taken for granted as it results in more abuse than friendly chatter. Would you really want your gaming rivals messaging you while offline? Only to come back online to receive a lot of spam of how they can beat you, etc etc