WSB (as of V1.0) supports pligg platforms only. You can use Gscraper to scrape sites for WSB. You can load inbuilt-keywords in Gscraper and it provides proxies too (for one week only as a trial). Use the below footprints to scrape the sites :
"Published News" "Upcoming News" "Submit a New Story" Groups "Create a Group"
"Published News" "Upcoming News" "Submit a new story" "What is Pligg?"
"Published News" "Upcoming News" "Submit a New Story" "Powered by Pligg"
inurl:/register "Powered by Pligg"
inurl:story.php?title=
"Pligg is a Web 2.0 open source content management system"
"Powered By Pligg" "Legal: License and Source"
"Designed by Pligg Templates"
"Already have an account? Fantastic, log in below!"
"My Pligg Site gives you a place to save and share your favorite web links"
"Pligg Content Management System" "Register an Account"
"Powered by Pligg CMS"
"Sort news by: Recently Popular" "Top Today" Yesterday Week Month Year
inurl:"/pligg" inurl:/register.php
inurl:"cloud.php" intitle:"pligg"
inurl:"faq-en.php" pligg
inurl:"live_comments" intitle:"pligg"
inurl:"register" intitle:"pligg"
inurl:"upcoming" intitle:"pligg"
inurl:/register upcoming published submit "Tag Cloud" -inurl:.php
inurl:"/register" upcoming published submit
inurl:"/register" upcoming published submit -inurl:.php intitle:"register"
inurl:"/register" upcoming published submit "Tag Cloud"
inurl:"/register.php" "Powered by Pligg"
inurl:"register.php" upcoming published submit
"Email:" "Lowercase letters only" "Password:" "Five character minimum" "Lowercase letters only" "Five character minimum"
"Du hast bereits einen Account? Prima, log dich hier ein!"
"Pligg is an open source content management system that lets you easily create your own social network"
inanchor:"Pligg beta 9 Home"
inurl:/register intext:"upcoming" intext:"published" intext:"submit" -inurl:.php
inurl:/register intext:"upcoming" intext:"published" intext:"submit" -inurl:.php intitle:"register"
"Powered by Pligg"
"What Is Pligg?"
intitle:"Pligg Beta 9"
"http://www.pligg.com"
"Published News" "Upcoming News"
"Submit a New Story" "Powered by Pligg"
inurl:"story.php?title="
"There is No need to Register an Account" "Just Go And Submit Your Story on Click Below Link" "Submit a New Story"
"Submit a New Story" "Please follow a few simple guidelines to make this site a better place" "Avoid duplicate submissions"
After the sites are loaded just launch detector from WSB and import the text document. All the known sites will be loaded in WSB.