Seems an odd question but Youtube has done a deep research on this and has came to very interesting results.

If you spend an hour or two on YouTube, you’ll see that creators there have their own kind of opening statements. And many of them start their videos with the same or similar opening words.
But, what is the most common message YouTube creators open their videos? Is it by saying things like:
Hello everyone
Yo
Hey guys
Hi guys
Good morning
What’s up?
There is actually data on this. Scroll down and see the results.
Youtube Most Used Welcoming Statement
Based on YouTube study on about 1 million videos, the most common opening statement is: “Hey guys.“
About 36% of the videos in the study list started with “Hey guys.”
They have data for last 10 years and there has never been a year when “Hey guys” wasn’t at the top of the list.
In second place this year: “What’s up,” which was also #2 about a ten years ago, then dropped to #3 and #4, and again started getting more popular last year.
And #3: “Good morning,” which YouTube gives credit to the growing trend of the “get ready with me” videos.

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