I think you are being a bit sensitive Glitter, but I understand you feel left out, which is a horrible feeling.
I recently missed liking my brother's engagement announcement because it never came up on my newsfeed. Luckily he doesn't rate our relationship in Facebook likes. 
For some unknown reason, Facebook also rarely serves me up statuses from my group of best friends, although it shows me everything my cousin's wife (who is mainly an acquaintance) posts!
I tend to like only the odd status I think is particularly funny or fits my mood at the time. I honestly don't consider that liking a status on Facebook has any relevance to my real-life friendships.
I post on some people's statuses more than others, but it doesn't mean I like them any more than other friends. One of my best friends writes very boring status updates about her job which I never like, but I love her in real life where she is funny and witty (and her job is only a tiny part of her).
So I would try not to read too much into it. Or if it really bothers you, maybe step away from Facebook as it can magnify feeling left out totally unintentionally.