Do you have the ability for people to choose their audience - like a group of people they are comfortable goofing off around and another group they want to pres

Do you have the ability for people to choose their audience - like a group of people they are comfortable goofing off around and another group they want to present a more professional face to? I think this is one of Facebook's killer features. Another feature I miss having on Twitter is the ability to manage comments on one's own posts.