Is there a reason why this macro does not work

#1 
\define facebooklink(title:"Facebook")
<$list filter="[all[current]has[facebook]]" emptyMessage="No Facebook event"><a href={{!!facebook}} class="tc-tiddlylink-external"  target="_blank">$title$</a></$list>
\end

When I use this Macro, the target="_blank" attribute does not in fact render for whatever reason.

#2

Seems to work on tw .com

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#3

I checked it again and I realized I wasn’t actually using the macro, but rather the content of the macro in the tiddler itself, if that makes any sense.