New ask Hacker News story: Should I implement email verification during sign up?

Should I implement email verification during sign up?
2 by montekaka | 0 comments on Hacker News.
I'm working on a new app, and wonder if we should verify user email address during sign up. I notice some app allow user to sign up with a fake email address e.g. abc@abc.abc, but some doesn't. What's the pro and con for allowing fake email address? Thanks