How NOT to cultivate your social network

We often talk about how to cultivate your network--what about how not to cultivate your network?  What things negatively impact your social capital?  Some obvious ones would be not returning calls, not following through on something you said you would do.  Continuously being on the receiving side of a relationship would be another.

I'm also thinking of a few situations lately that bring this question to mind...making referrals, and then seeing my contact handle the situation in a way that made me feel uncomfortable that I had made that referral.  The take-away on this is that when someone makes an introduction for me, I need to keep in mind that the person is extending him or herself by making that connection.  I need to be aware that how I proceed with that contact is going to impact my relationship with the introducer.  Being insensitive to this dynamic is another way not to cultivate your network.

These are just a few additional ideas that come to mind--I would welcome thoughts from others on how not to cultivate your network!  Sometimes negative examples can be valuable for our learning.