Does anyone know of "friend discovery" services using OStatus? Most proprietary social networks have that "let me riffle through your addressbook" thing, which

Does anyone know of "friend discovery" services using OStatus? Most proprietary social networks have that "let me riffle through your addressbook" thing, which I imagine the privacy-conscious would eschew (I certainly do), but e.g. my Twitter "following" list is publically available, so it shouldn't be hard to go through that and find people I'm following who are also on an ostatus-compatible service somewhere