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Old 12-24-2013, 04:49 AM   #7
DAIqbal
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Join Date: Oct 2013
Posts: 4
Social book marking is effective but supposed for some social book marking sites only including delicious, reddit, stumble upon and digg. Some experts say that stumble upon has also lost its reputation and there have been several quires that stumble upon has received for removing the links from the users. It is only effective when done properly and obeying the rules otherwise it may hurt the rankings.
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