I lie all the time. I tell people what they want to hear.
When I am invited out, and I don't feel like being in the presence of other people, I will make up an excuse. I don't know whether it comes across as an authentic excuse, but it still works better than being honest and saying, 'I don't feel like hanging out today'. I will also make excuses to avoid seeing people I genuinely do not like, for fear of offending them. What I would love to say is, 'I don't want to go anywhere with you, because I don't enjoy your company'.
I lie when my mum asks me how I feel. If I told her about my anxiety, my depression or any other confronting emotion, it would only lead to her disappointment and at least 24 hours of regret. So I tell her I'm fine. When someone asks, 'how are you?' at work, I tell them I'm well. The majority of the time I'm not. Especially since work is one of the main reasons I'm not 'well' or 'fine'.
I lie through my facial expressions and body language as well. When someone tells me a story, I pretend to be interested. Most of the time, I find it dull. When someone tells a joke or story that is intended to be funny, I always fake laugh so that they don't feel bad.
Then there are some pretty serious lies I've told over the years. Those have been to protect me, rather than other people.
I'm honest about my failings as a person, though. I also do not hold much value in material possessions and income, so I don't care enough to lie about my financial situation.