I am a prolific user on many social media sites and I used to love Propeller. There were many reason behind that, mainly simplicity, less spam, quality stuff and very cool and easy navigation when compared to other sites. However my love has now shifted from propeller because of the redesign that they have made on there site.
I am now not very active on Propeller as you people can see in my profile. And this is the case with many people on propeller. A proof for this is a alexa snapshot that I have taken to compare propeller and mix (another social media site). Mixx is relatively new in this area, however mixx.com is not the only site which has gained from this move of propeller there are many more like reditt.com and digg.com are two main beneficiary of this move.
I just hope that we soon see some changes in propeller so that we have people coming back to propeller.com