Circls is a two-way limiter of data input. The sharer limits a post to some circles, and the receiver only sees the post in a circle in which the sharer is in.

Circls is a two-way limiter of data input. The sharer limits a post to some circles, and the receiver only sees the post in a circle in which the sharer is in. This two-part filter is what Google is betting on is enough to sort the stream. Also important: Google is really good at sifting through a big mass of information presenting you the relevant stuff. This in itself is enough that they have an edge in my opinion.