I had a quick look of Google Plus. I found that is a mixture of Facebook and Google Wave. You can put your contacts into different circles.You can get the friends' update from the circle. That is very similar in Facebook, you can put friends into the group. Another main feature of Google Plus is chatting. You can form a circle (group) to chat. That sounds like Google Weave. Just now, they don't call it weave, calls it circle!

Those features are interesting, I may try it out in the future.