What's your experience on collecting first names when you sign people up for your email list?

What's the consensus on if it's a good idea to collect first names on email list signup landing pages? Pros? Cons?

submitted by /u/RusticBohemian
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source https://www.reddit.com/r/Emailmarketing/comments/knbvz0/whats_your_experience_on_collecting_first_names/