So you link all your accounts to this place? seems like a good place to get stalked as it's all public.
That isn't really what it is for, nor is it something you have to do.
It is effectively a centralised public key exchange and you attach accounts such as github / twitter / facebook in order to prove your identity (by announcing your public key publically through those accounts). You don't have to attach any of them, but the whole point of the system is to be a source of trust for identity which enables encrypted communication. If you create a public key but don't tie it to an online identity of yours by publishing it, why would I trust it?