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Few things of Jetpack are just amazing. But I don’t like its related post module; since it kill SEO.
Want to see live, how it affect? Let me tell you methods
1. Search on Google inurl:?relatedposts_hit=1

2. Click on first link, as site open, quickly copy the full path from the address
3. Again search in Google inurl:example.com/permalink/ without query string
4. You will see something like this.

Meaning by this, JetPack Related post module encourages duplicate URL indexing.
Now, you may arise a question – What’s about canonical?
Unfortunately, most of the time it doesn’t work in case of query strings. Seems problem with Google.