SevenCubed - 2:41 pm on Oct 24, 2013 (gmt 0)
A real quick (not negative) observation from the outside in:
LinkedIn is primarily a congregating place for business people. If you are a business to business service you may be able to benefit from it. If you are a business to consumer service you'll be singing to the choir.
But even if you are singing to the choir, they too are consumers albeit (mostly) intelligent ones. They are also influential within their own circles.
IMHO you'd just better be a very good vocalist or the crowd will see right through your motives much quicker than the minions at facebook, Twitter or Pinterest.
And, if you join, you'll be perceived as fresh meat to be poked and prodded for commodity value by other choir members.