'Just' is not wrong. It is fine.
Several time words could fit in there: Already, just, recently,...
June 27, 2013
"Just" and "already" are both correct but may have slightly different meanings.
If you have JUST seen that video, you saw it very recently.
If you say you have ALREADY seen that video you may have seen it recently or a long time ago or any time!
June 29, 2013
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