Answer: lurked

AnswerCrossword Clue
LURKEDHid in the shadows
LURKEDRead but didn't post, at a Web forum
LURKEDWent furtively
LURKEDRead chat room messages, but didn't post
LURKEDProwled.
LURKEDLay in wait.
LURKEDLay in wait
LURKEDMoved furtively
LURKEDKept one's own counsel, online
LURKEDActed suspiciously
LURKEDWaited in hiding
LURKEDWas behind the arras
lurkedLURK, to lie in wait
lurkedto lie hidden