You shouldn't have to ping, really, but it's a quick way to notify the listing service/s that your blog or feed are up to date, after you post.
If you ask for a ping, you better be updated, or sooner than later the service will label you a spammer.
You don't update, you don't ping.
Usually, these pinging services and aggregators like Technorati ping you anyway, just to check. The way these programs work is they slow down progressively if you don't update, and more often if you do.
If you don't update for a few months you're probably not getting more than a cursory ping once a week.
The more you update, the more you ping, the more you get pinged.
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