How to find Bookmarking sites

There are three major social bookmark platforms that I know of, pligg, scuttle/scuttlePlus, and PHPDug. Once you know these then finding the sites is peace of cake.

Basic Search
This is the most common way to search for social bookmarking sites. Just type in:
“Powered by …..”
Replace the …. with the platform:
HTML Code:
“Powered by pligg”
“Powered by scuttle”
“Powered by scuttlePlus”
“Powered by PHPDug”

Advanced Search
Now I said the platforms are by default have those signatures, but what if the social bookmark sites’ owners decided to remove them? They will actually, most of the sites that you can find using the above method would be sites with lower PR, most is 3 or even 4.

This is how you find sites from “more serious” owners and the chance to get higher PR social bookmark sites, You need to identify a unique url in each platform, for example:
In Pligg, they have a function for searching stories, they use the following url: HTML Code:
hxxp://socialbookmarksite.com/shakeit.php
Then you would use it in search engines like this:
HTML Code:
inurl:/shakeit.php
Other examples:
PHPDug: HTML Code:
inurl:/upcoming/0/viewall/1.html
Scuttle: HTML Code:
inurl:/populartags/
Play around with the methods, you can collect as many social bookmarking sites that you want. The methods work for just about anything with similar platforms.
Suggestions

You can use any search engines for this, but I prefer yahoo instead of google. Google can stop your search with a reason that your search is similar to how hackers/viruses work.

Use pagerank and/or dofollow tools like firefox addon searchstatus to help you in your search. If you just want to collect the sites just do it, check the PR later with digixmas’ pagerank tool (bulk pagerank check).

Here are "a few" more:

Directories footprints:

Powered by: php Link Directory
powered by PHPLD
Powered by WSN Links
powered by PHP Weby
Powered by cpLinks
Powered by cpDynaLinks
powered by BosDirectory
Powered by Link manager LinkMan
Powered by Gossamer Links
Powered by K-Links
Powered by In-Link
Powered by eSyndiCat Directory Software
Powered by: qlWebDS Pro
Powered by Directory software by LBS
powered by phpMyDirectory.com
Powered by HubDir PHP directory script

Pligg sites footprints:

inurl:"register.php"++"powered by pligg"
inurl:/register intext:"Powered by Pligg" -inurl:.php
inurl:/register intext:"Powered by Pligg" -inurl:.php
inurl:"register" intitle:"pligg"
inurl:"cloud.php" intitle:"pligg"
inurl:register.php intext:"upcoming" intext:"published" intext:"submit"
inurl:/register intext:"upcoming" intext:"published" intext:"submit" intext:"Tag Cloud" -inurl:.php
inurl:/register intext:"upcoming" intext:"published" intext:"submit" -inurl:.php
inurl:/register intext:"upcoming" intext:"published" intext:"submit" -inurl:.php intitle:"register"
inurl:/register intext:"Powered by Pligg" -inurl:.php
inurl:/register.php intext:"Powered by Pligg"

For Countrybase you can try ‎"powered by pligg" site:.de" for German "powered by pligg" site:.es

This is by my beloved brother: "Ramkrishna Bhattacharjee". Thanks a lot for sharing this.