(Or Wallperv): Someone who on social networking sites (Facebook etc), routinely reads other people's discussions or comments, but leaves no trace of their intrusion into their victim's privacy. Usually, they then discuss this information with fellow wallpervs, having all undertaken the same activity. Normally in denile about their actions. Tool of the Facebook Stalker.
''Hey, did you Alicia's in town today?''
''No... How do you know?''
''James is such a wallpervert...''
''I know man... Have you see that conversation he had with Johnny?''
''No, but Beth's fallen out with Hannele again!''
''OMG - Link!''