Pages and New Posts On Peoples Walls

I have this comedy page, and i've seen some weird things happen. Sometimes when I post it doens't even show up on peoples walls, usually this is after I post a few pictures, so i'm guessing this is some kind of spam filter? Weird thing was my last image posted it was on peoples walls enough for one like and then totally vanished... It's confusing me how this system works can anyone offer me some explanation to what happens?

*Update* Shortly after I posted ten minutes later the page ended showing up on news feed and got 2 more likes. Still confusing on how that works... Any help is appreciated.

Hello,

Yeah a new filter from FB do that for me to , it cant be viral now , any suggestions ?

I use actually domain rotator , but some domaine become blocked by FB , blacklisted..