In reply to:

Well, but WW, one might say:

He is her good friend and I read three of her posts.

That sounds right.

And I wouldn't argue, although the sentence itself is awkward.

Rephrase it just for fun:

He is hers and I read three of hers.

However, I don't understand the point you're making.

Thanks, Faldage, for the note. I'm becoming accustomed to the muted voice here.

I just reread what I wrote, and the word hers has taken on that other-worldly appearance that words sometimes assume.

hers

Weird. Just plain weird.