Filtered Posts - who is on a filter

[oilrig]

Title
Filtered Posts - who is on a filter

Short, concise description of the idea
Ability to see who is able to view a friends filtered post

Full description of the idea
When a friend makes a filtered post, all you can see is that it is not for all by the padlock symbol. I cannot tell if it is to all friends, a set filtered group, or even just to me only. I therefore don't know who can see my replies, or may know about an issue irl.
An ordered list of benefits

• Knowing who will be able to see your comments/add to your comments

An ordered list of problems/issues involved

• None