I don't think it's essential to read and upvote immediately. I do think it's good though to let them know you upvoted them or in a post comment mention you found them on post promotion. That way you stand out from all the others on the post promotion page and it builds a culture there that people should interact rather than just spam the wall. It's not a hard and fast rule of course but just something I think makes postpromotion better.
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good point ... my problem becomes that by the time I start reading.. I have 30 or more posts open from various sources so I don't really know where I found them. Maybe I need to find another exploration method :)
Not sure you should tell people that you voted for them though. It might be seen as putting psychological pressure on them to reciprocate. It is a tricky issue.