Differences and Stats: Personalized vs. Non-personalized Outbound Campaigns

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Hey guys, I am looking for someone who is doing hiring outbound campaigns. I have got two questions.

1.
What is difference between personalized outbound campaigns and non-personalized outbound campaign (do you have some stats: open rates/reply rates, etc.)
2.
How are you gathering data about people you want to hire? Is it just LinkedIn?

Thank youuu 💪