Thanks for the info.
I also discovered that there isn't any notification of new messages to forum posts! ??
Shared pictures
I would think if someone did share, or open their pictures for you, they would have told you at some point. Maybe go back through your messages?
There is no such tool available on the site, however when you view anyone's shared pics you can always make a note for yourself stating such on their profile. You can then make a search of those who you made a note of if you ever wanted to look it up or just click on the profile you were curious about and your note will be there to let you know.
I looked around and tried to search for a website thread but I couldn't find one.
Is there a page to see who has shared pictures with me or do I just need to stumble on a profile and happen to check their galleries?
Is there notification of any kind?

