quote:
would it just show as the person being offline all the time if they had blocked you?
Yes, exactly that.
quote:
if this is the case how will you know if they are genuinely offline or if they have blocked you??
You won't know, that's the point of it. Although, naturally you might guess you've been blocked if a contact who has regularly been online before, doesn't show up anymore...
Also, if they even have deleted you from their contact list (they don't appear in Options > Privacy > See who has added you to their contact list), it's usually quite safe to assume they've also blocked you.
And any possible block checkers
aren't reliable.