For sales people or anyone with a large customer data base, the limit is meaningless (for example, I have over 5,000 contacts in my Outlook address book, but can't invite all of them. Who do I leave out?) If I change companies, it is very conceivable that my contacts will change with my job function. So I won't be able to invite all of those new folks.

Let me throw in a sales anecdote here. My longest sell cycle was 4 years. That was very unusual, but it happened. I network with people because we all help each other sometime. You help me today, while it might be a year before I can do something for you. The pay-it-forward philosophy is also important, since it all comes full circle.

The only reasoning that works here is that unlimited invitations and connections can't be monetized. Several commenters have discussed that. LinkedIn's usage numbers, and the time spent in the program, don't come anywhere near Facebook or any other application, and the developers would like to change that, I'm sure. So I'd like to remind LinkedIn's developers that the more activity I've got going on, the longer I'll be working in the program each day. The other day I was here for 8 hours. If that's what you'd like to see much more often, then please remove the limitations.

- Neal