This is a strange topic, but over my life time I never gave too much credit to the talkers. Every time somebody start telling how good they are at X, or how much they did on Y... It always felt like fisherman tales.
If anyone ever tells you "I'm very passionate about XYZ", but they never did anything for XYZ (e.g. "poverty"), then he/she is not really passionate about it.
Another example is when somebody tells you "I only use product WXZ because...", but their actions doesn't correspond to that, then you know their are a "talker". E.g., "I only eat organic food", but then she goes to Red Robin and order a bacon cheeseburger.
And to paraphrase a great quote from Batman Begins:
"It's not who you are underneath, it's what you do that defines you".