Learn English – Starting a sentence with “In the following, …”

"If you must know..." typically introduces a fact that the speaker is reluctant to reveal. It's a little rude, as it implies that the listener is being nosy (intrusive). E.g., "Why weren't you at work yesterday?" -- "If you must know, I was visiting a family member in the hospital."

"You may/might know" introduces a fact somewhat apologetically. My understanding of it is that it's apologizing for wasting the time of the listener if they already know the fact. I think it also implies that the speaker isn't presuming that the listener is ignorant of the fact (to prevent insulting the listener's intelligence).

I agree with @Bill's comment - to me, Anglophones are normally native speakers only.

But for me, that's largely because I wouldn't normally refer to "an Anglophone" in the first place. I use the plural form specifically to include people from many different countries who speak English as their mother tongue. Anglophones are representatives of whole linguistic communities.

But by most dictionary definitions, many non-native speakers here on ELU qualify as Anglophones (they speak English), so I can't deny that technically speaking Reg Dwight, for example, is an Anglophone. But in most contexts where I want to convey that someone speaks/understands English [fluently], that's how I phrase it. I've no real use for a word meaning person who speaks English fluently - either by birth, or through extensive exposure/familiarisation later in life.

For most people (read, me), Anglophone either identifies those specific members of a multi-lingual population having English as their primary language, or it collectively identifies all native speakers. But you can't normally "learn" your way into either category; you have to be born into it.