[YuriTokoro]

Does “its” mean “JF’s”?

Originally Posted by Koir

In this case, "it's" is a contraction of "It is" and refers to the role individuals like you play in keeping JapanForum a successful site on the internet for cultural exchange.

Hi, Koir. I’m sorry for being so slow to answer.
Thank you for helping as always.

So, in this case, “its” means “the role individuals like you play in keeping JapanForum a successful site on the internet for cultural exchange.”
(However, this seems to be too long.....)
“not to mention its continued success” = “not to mention the role individuals’ success”.
Is this right?
You mean “not to mention that we are doing very well in this forum”, don’t you?

The two phrases you quoted have essentially the same meaning, as Colin Howell pointed out (mentioning something by apparently not mentioning it). However, both phrases cannot be used in the same sentence as they require slightly different contexts and sentence structures. That way, the concept of getting the reader's attention to a concept by appearing not to mention it is communicated successfully.

They require slightly different contexts and sentence structures?
So, that’s not to say that I can say any of them instead of “not to mention”, right?
“…X, much less Y.”
“…X, let alone Y.”
“…X, to say nothing of Y,”

What are the differences among them?
If I say “It's helpful individuals such as you that provide the reason this forum was made, to say nothing of its continued success.”, is this strange?

Apologies if I continue to cause confusion, Yuri. As ColinHowell wrote earlier, this is a case of a native English speaker using a complex expression to communicate concepts without truly knowing what is being said.

I apologies, too.
My inapprehension seems to be too terrible.
Koir, Thanks.