Most of blogs and websites did not having site authority and they might have extremely low social media activity so most of time their content was not going to index by search engines and it takes lots of time to get crawled itself , and for that pinging is the only easy and simple way to send signals to the search engine bots for index your content like blog post, images, text, videos url etc.Before pinging your site we are highly recommend you to submit your site url with sitemap to major search engines and get webmasters account to know more about how many post are indexed or not.
Don't worry if you are not having enough time submit site and verify that just use simple trick go to google.com and search for - site:www.mysiteurl.com that's all in results you can see how many post and pages are indexed.
How it works
Pinging sites are just sending signals to search bots, some web directory to know about your website content there is no guarantee your site will be getting index so make sure your web pages are properly optimize or not blocked by robots or anything else.
Do remember you can automate fast indexing by linking your content to social bookmarking sites.
Note:- There is noting wrong if anyone pinging his website but recommended practice is if you made any change in any post so ping the post url or if you did posted any new post or article so start pinging your new post urls.
High PR Ping List for Faster Index.www.pingomatic.com
How to Get index your content as fast as possible without pinging.
Did you know social media is playing spacial role in seo industry and it also help you to deliver your shared content to the search engine yeah it really works.
Make sure are you using your social media accounts regularly and posting content and feed frequently- daily or weekly on social media pages including Facebook, Google +, twitter or in bookmarking site submit your links on social sites heavily, don't be worried about anything your site will not going to slapped by google these social media sites are having huge authority, but before sharing your content to different places make sure you are adding any value think about readers first and then for Bots, it helps you to get more regular readers or visitors.