What is meta?
- Any Stack Exchange user can ask a question
- The community provides support, votes on ideas, and reports bugs
- Your voice helps shape the way Stack Exchange operates
I sure would like them not to be indexed by search engines.
This is a chat, it's half informal, why would you want that indexed by Google? Questions and answers, ok, that's the whole point, it brings answers to people searching. But chats? I don't see how it would be useful to the world.
It's like comments under questions and answers. They don't bring value which would be interesting to index on a search engine, and as such, are explicitly advising them to not index them (if I understood the whole "nofollow" thing).
Yes, they will be indexed. They are public by default.
(you can't talk in a room unless you have 20 rep on the parent site, but you can listen as much as you want)