LURKER

many modern Internet communities now advise newbies to lurk for some time to get a feel for the specific culture and etiquette of the community, lest they make an inappropriate or redundant comment, ask a Frequently Asked Question, or incite a flame war. This leads to the tongue-in-cheek command to "lurk moar". The verb to "de-lurk" means to start contributing actively to a community having been a lurker previously.

source: wiki