Hi EIREXE,
Sockets don’t work with flipbook components in 4.4 or earlier, but in 4.5 you can now use sockets with them. sockets authored in each individual frame are exposed via flipbook, letting you use them as normal ( only gotcha is that you have to author socket positions in each frame, not in flipbook editor, so be sure to use same names in each frame).
You can check out 4.5 preview now by adding an Engine Slot in Library page of launcher and choosing Preview.
Cheers,
Noland