Hmm, I disagree. I think it's a good idea to streamline the terminology to avoid confusing people. And 'share' is the term used elsewhere, no matter what the type of sharing involved. Also, if 'follow' has any meaning in Diaspora, it is 'share with someone who is not sharing with you, so that you receive their public posts but they receive nothing from you'. That is not the case here, because if you are automatically sharing with someone who has started sharing with you, it's not a 'follow' because you're now sharing with each other.

Open to discussion, though.