The book is very useful at least in the following perspectives:
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Not all features like 'Number of invites allowed' are given a good coverage in LinkedIn Website. The number of invites currently is 3000 per account life time.
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Ways to make the best use of LinkedIn (particularly job search, business deals etc)
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The author also has compiled a good set of 'WishList' that many LinkedIn users have towards LinkedIn.
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Deepak K Vasudevan
Architect
http://deepakvasudevan.blogspot.com/
http://www.lavanyadeepak.tk/