I saw a fascinating article in today’s Search Engine Journal: Google’s Martin Splitt Explains Why Infinite Scroll Causes SEO Problems. Read it for some background information, but the bottom line is that Googlebot (the Google web crawler/indexer) does not scroll web pages, which means that any content exposed via infinite scroll is not indexed.
Infinite scroll can also cause other problems: some screenshot browser addons and services have difficulties rendering infinite scroll web pages. It’s easy to love infinite scroll as a user since it gives the illusion of infinite content, but it can be a nightmare for automated services.
The fix: Make sure that all content on a web site can be accessed without using the infinite scroll function. Also, send Google a sitemap so it knows where all the valid URLs are: https://support.google.com/webmasters/answer/183668?hl=en .