Members on line ?

[Proton]

 If it's obvious, but I missed something, please explain...
 There are three different colours showing the people on line (black, blue, red).. 
 

[vw]

Red reviewed on last 7 days
Blue posted in last 24 hours
Black everyone else


Bold if in friends list.   

Pink if fluffy.   

[welshpunter17]

It says at the end of the members online thing what the key is

[Proton]

Thank you Gentlemen..... 
 O! Yes one must avoid FLUFFY if possible...