I sometimes dream about people who exist IRL, but who i don’t know personally. I feel hesitant of posting who they are, in case they or somebody who know them will read it here on LD4all! Last night, for example, i had a dream where a person who was semi-famous a long time ago was mentioned several times. I have had other dreams about people who have been more or less famous, and it doesn’t feel right for me to post exactly who they are. Am i just being paranoid?
I feel the same way. Even when I’m not on LD4all I’m paranoid about telling people who I see in my dreams 
It isn’t difficult for me to tell somebody that i had a dream about them, as long as the dream wasn’t disturbing and i know the person. We talk about our dreams where i work, for example. Would it be more difficult to tell the actual person, or to tell somebody else that you had a dream about this and that person? For me, the latter is more difficult. It would feel awkward if they found out.