One thing that has been happening lately is that people will tell me something that I already know. Naturally, I respond saying something like, "oh I heard/read about that". However, I feel like when I say that, I come off a bit snobby or like I am a know-it-all. And I also feel like their body language confirms that.
I would prefer to keep the conversation going, by keeping it on-topic or switching topic. I would, however, also like to convey that I already know what these people are telling me.
How should I treat that situation? Should I pretend that I was unaware of whatever they're telling me, or is it just the way that I say it that is the problem?