Make sure you run your specific implementation past an SEO who knows what they're doing -- and on this issue, most don't. (The sweet spot is probably caching the whole page for non logged-in users and regenerating that "relatively infrequently", and doing the AJAX trick for your logged-in users only.)
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Make sure you run your specific implementation past an SEO who knows what they're doing -- and on this issue, most don't. (The sweet spot is probably caching the whole page for non logged-in users and regenerating that "relatively infrequently", and doing the AJAX trick for your logged-in users only.)