If your friend talks about getting a bunch of positive comments on a social media app that you don’t have, maybe ask them what all of the comments say. If he or she gives a vague answer such as, “They all say I’m really pretty or whatever” or “I got so many, I can’t keep track,” then they’re probably lying. Just remember that some people do a lot of these things normally, so it really depends on the person.

Just remember to be a courteous house guest instead of focusing all of your time on this.  If you do this more than a few times, though, they will probably get suspicious of you and think you’re trying to accuse your friend.

When someone is lying to you, they may begin to breathe heavily They may repeat words or phrases in order to convince you.

Remind your friend that you’re not angry, you merely want to talk so that this happens less. Make sure to go about the discussion in a mature way so your friend can fix their actions.