Social Networking Acceptance Rate Stats

From Jason Dowdell (via Claire Delong of Accolo): Konstantin Guericke of LinkedIn writes:

There are two types of acceptance rates…

1.) Those from invitations
2.) Those from introductions.

Invitations to connect are generally from people you know and trust already, like former co-workers, classmates, etc.. By accepting an invitation, you agree to make introductions for the person when he/she wants to meet people you or your contacts know. Of the people who send over 10 invitiations, 7% have an acceptance rate of 90% or higher. These kinds of conversion rates are unthinkable in traditional marketing, but only possible via word-of-mouth marketing where there are well-established relationships and bonds of trust.

Introductions are contact requests from people you generally don’t know and who are contacting you about doing business via an introduction from someone you know. When accepting a contact request, you are providing your contact information, so you can start a dialog about the opportunity via phone or email. When people receive an introduction, they accept it (meaning they provide their contact info to the sender) 84% of the time. This is quite amazing given that they generally don’t know the sender, and it’s a testament to the fact that business users realy heavily on social filters — they are much more willing to give their attention and respond favorably to someone who comes introduced (even if the sender is just a friend of a friend of their connection) than if they get contacted directly via phone or email where nobody is vouching for the sender and where they can’t easily look up the profile of the sender. It also shows that most users are careful which people they let into their LinkedIn network and that they give signficant weight to the fact that one of their LinkedIn connections is recommending the sender, based on their direct knowledge of the sender or based on the recommendation provided about the sender by someone they know and trust.

What comparable data can other services provide? Any ideas?