Which is the best social networking site for ...

Digg and technorati, but for me all social network are best as long as you post a well informative and relative to the topic you've posted.

 Community Marketing University stands heads above all the others.

The best and most reasonable priced social networking site is Community Marketing University.  I have belonged to this site for a while now.  We are exploding on the internet with a 410% increase this past Monday, Oct.. 15.  You could not ask for a better admin. who are available with live help over your computer 24/7.  The server is based in Colorado.  You are given all the tools for success free at  CMU7.  CMU7 is based on people helping people to succeed in any business of their choice.  You can join for free and we pay our free members 7% on first level and 15% on second.  This is a forced 4x7 matrix.  You can make 75% as an elite member.   Elite membership is $19.97 a month.  Just click on over to Community Marketing University and visit with us or attend our Monday Minutes Conference Call every Monday night at 8 p.m. Eastern Time.  Download the software free at CMU7.  Our conference calls are all over your computer.

Come on over and join us at CMU7 and be part of the most active social networking site on the internet!

Go to this link for the best you will get in Social Network Marketing. 

Community Marketing University

We Will Help YOU Succeed.

Best Regards,

Joyce Sanders

aka. roadcat 

it depends what you mean by social networking.  if you want to get back in touch with people who you knew in the past and get people to like you and to make friends quickly in order to get the name of your business out and to promote it, sites like Facebook and MySpace are wonderful.  It depends what you're looking for, and often, a combination of these sites is a very good idea.

How right you are Andy! I belong to eight of these sites.  I just find CMU7 the most active for myself.  It is all a matter of personal preference I suppose.

 I do belong to a couple that are associated with My Space.  They are all my favorites for advertising and promoting.

Joyce Sanders 

What about LinkedIn?

"Best" is really a matter of opinion. Here are some related to what you are looking for.

Business marketing social sites include:

Linked In (very popular)
http://www.linkedin.com/

Ryze
http://www.ryze.com/

Facebook
http://www.facebook.com/

MyBlogLog (Less Business Focused)
http://www.mybloglog.com/

Other social sites tend to mix up a lot types of users and are really more about playing some kind of popularity game on its own site. The demographics of many other social sites is not typically best for business purposes as the traffic generally does NOT convert, unless your business is a blog that sells ads or paid search links and needs this traffic and potential readership.

On that note these pass tremendous traffic (conversions from the traffic is another story):
http://www.digg.com/
http://www.stumbleupon.com/