LinkedIn Network

LinkedIn seems to be an excellent way to promote yourself. I am a recent member to this n/w and I am excited to find that I have already discovered a few ex-colleagues, I never even knew that they live right close by.
In my perception, the difference between expanding network and spamming is just a thin line. LinkedIn operates by feedback received. If any person declines you, that gets added to the negative pool; It seems that for those who sent a few messages, do not need to worry; However, for those who are sending out large number of messages, will put on notice;
LinkedIn provides a warning or a chance to correct your ways before shutting down your account (paid or otherwise).
In general this is pretty cool way to get in touch;