Photos: 'Tech or treat'

Halloween brings out the geeks. It's the one day of the year for which it's OK to pour 10 hours or more into making a perfect life-size replica of your favorite social network.

"John Marsland...Facebook for Halloween. Will you please write on my wall?" So reads the CNET analyst's sandwich board (shown here), which includes such interactive goodies as an iPhone for viewing video, a photo album he attached for flipping through images, and a good old-fashioned Polaroid camera for instant submissions to his "wall" (where Facebook guests post messages). There were plenty of lip prints, too, in the "gifts" section, proving once again that Facebook is hot.

Caption text by CNET Download.com's Jessica Dolcourt and CNET News.com's Caroline McCarthy and Candace Lombardi.