I have recently had a contact from LinkedIn which I didn't expect but actually thinking about it, it is a good way of giving people my background and some references, as any.
This person wanted to buy a flat in Luxor and when you are making an important decision like that then you definitely want to know who you are dealing with. But even renting a flat when you are paying in advance or handing over credit card details it is useful. LinkedIn is the professional networking website.
The public profile of Jane Akshar is here http://www.linkedin.com/pub/4/9a4/4a4