#LinkedIn is the most popular for older users
LinkedIn is the network of choice for most knowledge workers and #professionals. It is maybe the most conservative of the social networks due to the fact it is all about #business. It is becoming more social as it has realized that this will enhance its user penetration and attractiveness.
The latest statistics show it having 7% of its users over 55 and 14% in the 45 to 54 age range.