Tracking cookie-@liveperson.net

Hi all,

I got a low level tracking cookie alert that had one of my nicknames @liveperson.net.

which Norton security removed.

Out of curiosity I did a search on google and found that this company is a chatting service. I am not a subscriber to this service, so I am curious as to How:

1. they got one of usernames/nicknames

2. how the tracking cookie was created when I do not use or am a subscriber of their services.

Any help or clarification on this would be appreciated, so I can prevent this in the future.