[nl]

To date 7280 people have linked their Google+ accounts to Twitter using our service. We check these accounts for new Public posts every 10 minutes which represents a significant number of data points

If anyone thinks this is in anyway indicitive of Google+ usage they are fooling themselves.

Google has deliberately tried to build Google+ as a standalone product (as opposed to Buzz, which encouraged Twitter etc integration). That's a much slower path to take, but from what I see (in terms of in-depth conversations on Google+ itself) it's being quite successful.