de-lurk

If they have already had a question answered, they are even more likely to de-lurk and reciprocate.

Lurking allows users to learn the conventions of an online community before they actively participate, improving their socialization when they eventually de-lurk.

When you are confident enough to "de-lurk", click the RMB on the message you wish to reply to and select Follow Up to reply with a public message in the newsgroup or Reply to send a private Email to the author of the message.

When lurkers decide to participate more actively in the community, they "de-lurk," which Rafaeli, Ravid, and Soroka define as: "...transfer from passive participation (only visiting the forum to read) to active participation (actively posting opinions and thoughts on the forum)".