For my district, roughly K-8 encouraged 2 spaces but changed once I got to HS. I don't know if this was an artifact of teaching us to create bibliographies and citations in MLA Style or just for ease of editing.
College and Grad School either didn't care or vehemently adhered to 1 space.
APA Style and its variants seems reasonable to me, if only for the reason that it corrects a major flaw in AP - the lack of a serial comma.
Yep, in casual text conversations (i.e. chatting with friends) I sometimes use extra spaces between words or sentences as a stylistic choice to express tone.
College and Grad School either didn't care or vehemently adhered to 1 space.
APA Style and its variants seems reasonable to me, if only for the reason that it corrects a major flaw in AP - the lack of a serial comma.