Articulate in Mickey Mouse terms the Activity Story Stream Filter Setting meaning

It is almost too silly to ask but I have overcome my inhibition and will ask anyway. I guess the only stupid questions is the one not asked.

Soooo....., can anybody in laymen's terms explain me the difference between the filter settings in the activity story stream?

I tried looking for it but the exposed documentation doesn't mention it any more. It used to.

Having worked so long with Telligent I forgot to really articulate well what the different settings mean