1. Track fish where they are playing.
2. Don't you have any friends that play poker? you can find them and sit at same table
to chat.
3. Some use the feature to find people they dislike to annoy them.
4. Anti-social's find this feature a good dating /starker site.
There more but think this is enough to answer your question.
1. What kind of degenerate friends people to track them and harass them? I'm all for winning but I consider this immoral.
2. I do have friends that play poker, but most of them play live, in home games. And even then I wouldn't add them. I don't consider anyone my friend at a poker table. I only added Rifflemao because he's good, and I respect him.
3. That's rather unethical, would you like it if people that disliked you followed you everywhere just to annoy you.
4. I have a girlfriend and have no interest in anyone else.