I can list limited characteristics of bad backlinks, look into links you are getting and find following characteristics:
You can check bad backlinks before building them and later on you can identify them by any tool.
Backlinks are links that come from other websites and that link to your website. There a good and bad backlinks and having backlinks is very important when trying to make your website well-positionned on search engines (google, bing, ...). I would definitely suggest you to take a look at that page (Wikipedia): http://en.wikipedia.org/wiki/Backlink :)
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Yes you can use ping on a daily basis to your backlinks. This move cannot hurt your SEO.
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