The service right now is quite good.  
The first implementation is circles is just broken IMO. Yes, it is a very pertinent observation (you have different social circles) but nobody is ready to take the time to create these.<p>Instead one of the last updates brought collections. It is very reminiscent of Pinterest but does not just focus on pictures. It is a very handy way to maintain different streams like e.g. :<p>-random social banter<p>- technical subject 1<p>- hobby 1<p>...<p>The mobile interface could better serve this paradigm, but otherwise this is the best social product for me.