What's the best way to share my presentation slides online?
I typically post my slides on my website as pdfs.  On the title page of my slides, I have started adding a line that says something like "slides available on my preprint page", and sometimes I'll mention this at the start of my talk.  On my website, I have a page for all my slides and I also link to the relevant slides on my preprints page.  Personally, I prefer when speakers make their slides available as pdfs, because I like being able to download them and file them away, rather than needing to bookmark a website.  Similar to my preprints, I'm excited to have folks download my slides (so I don't see any reason to control their distribution).