Odd that this is brought up now. I've recently been saying 'lol' and 'fail' a lot, usually to myself. I said 'fail' 3 or so times last week while at my boyfriend's house, with only him to hear. I don't think there's anyone else I'd say those things around, it would sound out of place or like I was obsessed with the internet. Generally other people wouldn't understand or care for jokes like that, it seems. It would just be awkward.