What do the different player orb colours mean?

[Pepsiplz]

In Fable II a green orb was a friend, but that isn't the case with Fable III. I notice pink, green, and like bubbly orbs (have a thick translucent purple bubble around them). The colours don't have any obvious meaning to me. The green ones aren't my friends, neither are the pink or bubbly ones. They're all strangers so why the different colours? Do you know what they stand for?

 

[m800_runner]

the transparent i think is "doesnt allow join", "Away" or "moving". green is open to everyone and blue is by request only.

 

[Pepsiplz]

Wow! Thank you! I have been wondering this for a long time. I haven't joined any games yet and this will make it easier when I decide to join one! I haven't seen a blue one yet. Maybe I'm blue tho. I am by request only. Oh and feel free to ad me on Live if you want. My gamertag is my forum username.