Internet message board (5)
I believe the answer is:
forum
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">internet message board</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for forum that I've seen before include "Court - conference" , "Place where public meeting or discussion is held" , "Ancient Roman marketplace or place for public discussions" , "Internet message board" , "Medium for discussion" .)