PETA now following people on twitter

Its fun to talk with so many people on twitter , this is what i thought before PETA (People for the Ethical Treament of Animals) started following me. Now i realized that twitter is not a place to talk anything to everyone, you gotta watch your words before you spit them out. I had a lil chit chat kinda conversation with my friend, and i was suggesting him to kick off a mutt who has been disturbing him since last few hours, but WTF ? Just when we finished talking, PETA started following both of us on twitter. Now I aint sure if this is the right and official people, but i wonder how they came to know that we are talking about PETA. I mean is there syndication sent by ALL TWITTER ? Or is there something like google alert ?

Peta’s twitter handle is http://twitter.com/officialpeta

Here is the snippet of tweets between me and my friend ..

Guys this is something serious. Just wondering how this keyword alert is done in twitter, as its a wonderful thing 😛

Cheers !!

Realin !