Given that the Panda algorithm includes engagement and user experience, when would you consider deleting a page that has poor engagement and conversion metrics? For example, consider a page that ranks well organically and receives (relatively) decent traffic from search. However, this page has poor engagement metrics compared to other pages on the site, does not convert visitors as well as other pages on the site, and doesn't have any external links. Would you consider deleting this page? Which metrics do you use when auditing a site and considering a web page from removal (bounce rate, average time on site, pages per visit, linking root domains, visits, revenue per visit, etc.)? Are some metrics weighed more than others? What kind of thresholds do you use? Finally, is there a situation when you would choose NOT to delete pages, even considering the above?

Is it possible to use both Schema.org and Facebook Open Graph for structured data markup? On the Google Webmaster Central blog, they say, "you should avoid mixing the formats together on the same web page, as this can confuse our parsers." Source - http://googlewebmastercentral.blogspot.com/2011/06/introducing-schemaorg-search-engines.html