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I saw on facebook status some of my friends are going hiking. I love hiking. Is it socially unacceptable to invite myself? I hear about how invting yourself is not good, but everytime I do it i get to go places. What do you guys think?
Yes, that would be very uncool to invite yourself. this isn't a party or something where if you invite yourself to tag along with a friend, he can ignore you the whole time if he doesn't want to spend time with you. Hiking is a much closer experience and if they don't want you there, you're going to come off as an inconsiderate, socially retarded, asshole for inviting yourself along.
The above posters that said to suggest that it "sounds cool" and that you'd be in to doing something like that, are right. Just let them know that you are available to be invited. Give them that knowledge, and let them make that decision without any pressure from you.