It's not what you're saying but it feels a bit unrelated in that it doesn't mean that it is not useful for Google to index tweets. More likely than one wanting

It's not what you're saying but it feels a bit unrelated in that it doesn't mean that it is not useful for Google to index tweets. More likely than one wanting to find a specific tweet, is one wanting an answer or pages related to a query where one does not care about where the result is hosted, and I would rather not search across several sites separately.