You have a community you feel you belong to so it's easier for you to come back to see what your community is up to. This is usually not the case for anyone trying something new for the first time. If they come here and all they see is bitcoin talk, they may never come back. But if they comment, and see some other replies or some recommended content they may like, that may get them to come back. 

The existing legacy social media features exist for a reason.