For billions of text posts. Good luck. With that.
On the surface Creative Commons licenses are "AI-friendly" - in that they exist to opt-out of parts of copyright protection - but in practice AI goes against the spirit of Creative Commons so heavily that actually complying with it is impossible. If your attribution string requires its own search engine, maybe it's not effective attribution?
For the record I don't think training is going to be fair use. The AI model you're training is usurping the market for new art/writing/etc, and there's a clear chain of provenance from the training data to the final model and specific outputs (in at least some cases, e.g. "draw a 1970s scifi robot" giving you C3PO).