Sharing post/content on social media like google plus, g+, facebook, nairaland, and so on, not only make the post popular or reach more people, it also helps your content get to search engines real quick.
Google especially gives more priority to content found on its products first before considering other platforms. Example of google products are google plus or g+, blogger.com, google hangouts, gmail and lots more.
If you want your content to be quickly crawled or saved to google search engine index, share your post/content on your google plus/g+.
An example is this post which I screenshot in the picture below: I made this post 20 minutes ago, and it is already on google search engine because I shared it on my google plus g+.