I am using busy.org since 2 months ago ,when steemit.com down temporary. Then I check for alternative solution and I got 2 sites first one is busy.org and another one is chainbb.com .when I research more about both sites , I get to know that chainbb deduct some amount from your reward around 15%. Where as the busy.org give me the extra rewards based on your followers. Which is plus point for busy.org .then I started using busy.org .
But I don't know about the invite system ,thanks for telling about this feature. The layout of busy.org like Facebook and its performance is better than steemit based on my experience caused I am using this site into my phone . I also think busy.org is a potential to eat steemit and soon it will happen.