I have been experimenting (fairly extensively!) over the past few days.
These are my notes — which may be useful to others:
Lightroom Classic CC
Create Collections in Lr Classic CC; right-click on the name of each Collection and Sync them to the Cloud.
Click in Top Bar to Make Public; then click on the generated URL (minute text next to the Make Public Button).
The Collection will open in your Web Browser (providing that you have installed Lr CC on your computer).
Click on any thumbnail to see the hidden icons for commenting, liking, or connecting to Facebook Etc.
Click on the Speech icon Bottom left corner for boxes for commenting and liking
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Lightroom CC
(For Internet/Cloud Storage work this is far faster, easier and more efficient than using Classic)
Launch Lr CC and click on the Laundry-basket (?!) icon in the left margin;
All of your Synced Collections should be listed as Albums.
Double click one of your “Collections” (now an Album) to open it
Some Basic editing tools are available if you need them at this stage, and so are Rating stars, key-wording and viewing-order controls.
To publish the Album for viewing by others, Control Click on the Album’s name and choose view Share Album;
The Collection will open in your Web Browser (providing that you have installed Lr CC on your computer or on your devices.).
Click on any thumbnail to see the hidden icons for commenting, liking, or connecting to Facebook Etc.
Click on the Speech icon (in bottom left corner) for boxes for commenting and liking.
Adobe could have made this much easier to understand and use with a more clearly signposted work-flow and with labelled buttons instead of confusing icons which hide themselves (Cheshire Cat style!) in margins.
You can make Albums from inside Lr CC: Just create a new Album and drag-drop images from your Images folder into the Album.
Add, or remove, images at any time in the future.
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And you were absolutely right when you said people needed to be signed in to post comments. I think that registering for an Adobe ID is sufficient — they don't need to be a Subscriber.
Lr CC may work without an Adobe ID for people whose clients have social networking memberships (like Facebook and Google) but I don't use them so I can’t test that.