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Campaign Monitor is good, but have always preferred Mailchimp. The industry standard I would say, free up to 2000 subscribers, loads of integration tools available for social and ecommerce setups and great reports and analytics integration.

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? I would improve the page. Beef up the content, add seductive links to get traffic to a more valuable page, add adsense to earn money if the traffic is low quality. 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.)? If someone brought me a site that needed help I would do keyword research to determine if they are covering the important queries for their line of business.  If they are not I would have a content plan to get them covered.  If they are covered but performing poorly we would improve those pages. Looking at the numbers you suggest is like cutting off a foot because you have a blister on your toe.  Decide instead if the foot is valuable.  If yes, cure it.

Hi Kevin, Thank you for your reply. I'm trying to understand how Google views URLs with # anchors as external links and how it passes value (i.e. PageRank), rather than how they index pages with # anchors. Sorry if that was unclear. Do you have insight into this question?

Here's a good place to start: https://developers.facebook.com/docs/concepts/opengraph/.