Online Connecting

It is funny to me that so many "influencial" people that i know do not spend any time online doing any networking. They all feel that online connecting is a waste of time and nothign comes out of it. The really funny thing is , these people all feel that way and have never tried it to see if online networking can being somethign to their business.

We have meet up
konnects
global grind
nirvana
zing
friendster
myspace
ryze
yahoo groups
model mayhem
casting 123
model mingle
designers-network
facebook
nolcha network
fashion-stars
the fashion spot

and i am sure tons more, even though i cannot login everyday to each one, I still feel that online networking is a powerful tool for a bust professional who can not attend every event but can drop a line or respond to an event or such...

What do you think? Do you have any other great networking sites?