When you save something on NowVia, you see who else has saved it and what people are saying about it.
So imagine 19 people from around the world save a great design resource - by doing so, they discover each other's channels, and can all discuss that resource in the same place. The 20th person to save that resource also sees that discussion and can join in. The focus on connecting people through interests and trying to encourage discussion is the differentiator.
But I have to wonder, how is this different from Pinterest?