Internet vocab: What does 'ping' mean?
In practical terms to ping is to notify a website(s) that you have updated your site with new material. This is often done automatically - some sites will update a blog and simultaneously send updates to Twitter, Facebook and other social media sites.
Ping technology has been a major tool used by security services to monitor traffic on websites advocating criminal activity.
Don't confuse with Apple's ill-fated social network of the same name.