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that at the end of this post you will find a filtered and somehow
manually edited list of Pligg-based social bookmarking sites, this post
is rather about some tricks which can help you to quickly evaluate the
quality and freshness of any directory list you find on the internet.
Finding a good list of Pligg sites
have previously attempted to find a comprehensive and organized list of
social bookmarking sites, but I just couldn’t find a sophisticated
collection of these sites similar to a quality directory list for
instance like eat-me.s-cars.com.ua has.
This time I have decided to look for a list based on the type of the
Social Bookmarking CMS. Although there are other specialized solutions
for creating a social bookmarking site (like PHPdugg or Scuttle), the
most popular of them is the Pligg CMS, so I have decided to seek a list of Pligg powered sites.
have came accross some sources which listed a few hundred of Pliggs or
other sites which wanted to sell me those lists for a few bucks, but
what seemed for me the most promising at first sight was published in a
forum thread and referenced from many other forums: this post stated
that there are 9000 Pligg sites listed there.
Evaluating the available lists
I was randomly clicked in this list quickly realized that there are
many dead sites and parked domains listed here. Nevertheless I have
copied this list and realized that instead of nine thousand, the list
contained only about 1735 links.
I have removed the unnecessary endings (/register.php for example) and
also cleared the www. subdomains to have a list of domains only.
Removing duplicate entries
As I sorted this list with OpenOffice Calc, I found out that there are many duplicate entries in this list. Having pruned the duplicate rows from this list with this method the list shrinked to 1548 sites.
Retrieving Page Rank values
Then I fed this list to Alex Polski’s very handy Mass PageRank Checker (run on my own notebook with MAMP)
to check the Page Rank values of the listed sites. The idea behind this
was that if a site cannot get PageRank value in almost one year (or
simply have lost it since the original list was published), then it is a
waste of time to deal with that site. Therefore the next step was to
sort the remained list by Page Rank values and eliminate those which had
PageRank zero values: having removed these sites not respected by
Google I ended up having a list of only 453 sites.
Checking Pligg specific URLs
third step was to check whether the sites in question are still powered
by Pligg. To validate this, first created a HTML page from this list
where the links were pointing to the /upcoming.php URI, so I have added
this to the end of every listed site. Since (hopefully, I am not a Pligg
expert) all Pligg sites have this subpage, with this trick, I could
identify the pages which are powered by pligg. Then I opened this HTML
file with Firefox having theFirefox Link Checker Add-on installed
and activated. This add-on simply goes through all links present in a
web page and gives them different background colors and a title element
to all links based on the results of the link check (with Valid,
Invalid, or Forwarded status). You have to wait for a while until
LinkChecker does the job, but when it finishes, you can download the web
page annotated by this addon. Note: This step also could have been done
before the mass page rank check.
clicked on some random links listed I had to realize that the result of
the latter step accomplished with the Link Checker add-on was far from
satisfactory. Some domain parking systems for instance will not give
you 404 Not found error no matter what URL you request, therefore — if a
parked domain still maintains its Page Rank value — these cannot be
filtered with the above described methods. Therefore I decided to click
through all the listed sites, and check all of them manually. At the end
of this painful last step the real list of Pligg sites extracted from
the original list has only 154 sites. (see below)
What was not validated?
pligg powered sites are dedicated to collect links from a certain niche
topic of only those links which are written in a foreign language. To
decide whether a site is useful for general link building since it
accepts submissions from all topics (or languages), you should visit
these sites one by one.
Dofollow/nofollow: Unfortunately I don’t know a good automated methot to check whether a Pligg site is dofollow or nofollow.
If you see somewhere that a certain list has many thousand sites, do not believe it automatically (see 1735 vs. 9000)
Things can change quite fast: a list published ten months ago can became rather outdated.
long list does not automatically mean quality list: in this case many
sites were already broken at the time of publishing (see comments at the
No automated tests can provide the same performance as the good old manual check procedure.
sites with good page rank values most likely concentrate on niche
topics or on a foreign language. For instance one of the listed PR6
Pligg sites is a non-English site with Joomla related news, while the
other is a Turkish site (which are useless for many of us trying to
avoid spamming these social bookmarking sites)