Ping term explained
Ping in SEO is a request about the content update used to specify third-party resources. Usually, these third-party resources are search engines.
Send pings to any service this means to be aware of updated or new pages. Typically pings are sent to Google when you update the site map sitemap.xml. You can send ping to Yandex.Blogs when you publish a new post.
Using the RSS feed and FeedBurner, you can not worry about the pings, this service sends pings automatically to a variety of resources and a new page appear in the results after a few hours.