When the infinite scrolling plugin is used , much of the html is hidden until scrolled , does Google see this content or is this plugin bad for SEO ?
Try doing a Google search on how Google or other search bots work.
A lot of your recent questions have not been specifically about Vanilla.
Please remember this is a support forum for Vanilla, not a general 'How to' forum.
Moreover, you should ask questions concerning plugins by using the "Ask a question" link on the plugins page. That makes it easy to look for already answered questions: http://vanillaforums.org/discussion/comment/226356/#Comment_226356