I think there is a difference in really wanting to push the boundary (the goal is interpersonal) vs wanting to just somehow broadcast what's happening in your mind (the goal is not interpersonal). The latter indeed sounds addiction-like.

I have a schizoaffective acquaintance who has this need to just somehow broadcast her many thoughts when they occur to her in abundance. So during certain periods she tries to call me every day or email or message very frequently. We have sort of agreed that I do not criticise her for that but I decide for myself if and how much I will read/engage/respond. So she doesn't need to feel bad about trying to contact and she does not feel mad to me for not responding all the time.

However, it seems to me that this is not the process Lrad is talking about. I might be wrong but it seems to me that her attempt to contact is not because of broadcasting some information but a sort of communicative action itself. It seems to me that the goal of these actions would be to tell something to the T that is impossible to tell right now in words and in person. If that's true then this is not addiction-like at all but rather an attempt to really communicate something very important.