I got this "Please do not invite DLV to social network sites" notice and I swear I never invited you!
What is most likely happening is that you inadvertently "agreed" to let the site in question access your local address book or contact list and send automated invites to those on your list.
Some sites are very clever and downright sneaky in getting you to "agree" to do this, often by providing a pre-checked and deceptively-worded "invite my friends" checkbox which is on a page with considerable other distracting text.
These can be stopped by adjusting your profile on the site in question to disallow the sending of automated invites to those in your contact lists.
Next FAQ entry (10.21): I get error messages when I try to enter ratings or comments on the Big List.