Oh dang, I overthought this. I thought we had to type the submission mechanism into the empty box, and I was trying all these rebuses, like "TWITTER", "COMMENT", "EMAIL".
Really enjoyed this! Especially the thematic EEK clue (Didn't realise all four were thematic until I'd input meta - which was a lovely way to add an answer check :D)
submission mechanisminto the empty box, and I was trying all these rebuses, like "TWITTER", "COMMENT", "EMAIL".