LinkedIn - Who benefits the most?

It's likely that if a person satisfies the following criteria, he/she is in the best position to benefit the most from a social capital management software like LinkedIn:

1. Has a clear talent or unique professional value proposition (everyone will be happy to promote such a person to their own friends, colleagues or acquaintances)
2. Has had significant experience in his field, therefore would be an asset to tap for his expertise, wisdom and know-how
3. Knows about self-marketing and how to position himself/herself in other people's mind for maximum social, economic and political impact
4. Knows the market value of his/her knowledge, so he can trade and negotiate fairly to make sure everybody wins
5. Knows his own knowledge gaps (difference between what he currently knows and what he should know in order to have a great career)
6. Knows what it is that he knows, and how to apply it to different client situations
7. Has his own career blog, where he posts his latest intellectual capital (white paper, technical articles, keynote speeches, methodologies, work samples, resume, etc.)

It is obvious from the above that a person has to do a lot of work before LinkedIn can become a useful and profitable tool.