“Yeah, I don't know... the privacy issue doesn't really concern me too much.”

You're talking with a coworker about why she doesn't use social networking web sites like Facebook. She says that she doesn't like to share her personal information. You don't think that's a problem, so you say this.

Yeah, I don't know... the privacy issue doesn't really concern me too much.

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Yeah

"Yeah" is a more casual way of saying "yes". 

Say this to agree with something that a person said:

Yeah, no problem.

Yeah, I actually did it myself.

You can also say "yeah" when you're going to disagree but you want to make your disagreement sound a little softer.

Yeah, but then it'll be blocking one of the outlets.

"Yeah" sounds less formal than "yes." 

Yeah, I don't know...

When you're stating an opinion that goes against what someone else just said, you can use the phrase "Yeah, I don't know..."

In a lot of English-speaking cultures, it's common for people to talk about their opinions on issues and to disagree with each other. But phrases like this one are important when disagreeing to let the listener know the level of your disagreement. When you use "Yeah, I don't know..." it doesn't sound like your disagreement is angry or forceful. It sounds like you're just stating your opinion, which happens to be different from the other person's opinion.

privacy

"Privacy" means being able to control who knows personal information about you. People talk about "privacy" in these ways:

  • We talk about "having some privacy" and "giving" someone some privacy:

    Can I have some privacy please? (Said angrily at a family member who comes into your bedroom)

    I'll give you guys some privacy.

  • We also say that you should "respect" someone's privacy:

    There is no defense for my actions, which I deeply regret, and I ask that you respect our privacy at this very difficult time. (said by a famous person who did something bad)

  • Americans mostly believe that we "have a right to privacy", which means that our privacy shouldn't be taken away by the government or by other people.
  • People sometimes talk about "privacy issues" and "privacy concerns"

    We don't store that information due to privacy concerns.

(something) doesn't (really) concern me (too much)

The phrase "___ doesn't concern me" means "I'm not worried about ___". Adding "really" and "too much" makes the phrase sound more casual.

You should know that there is also another meaning of the word "concern". If you tell someone:

This doesn't concern you.

...it doesn't mean that the person is not worried about something. It means that it's none of their business. It's not related to them. Usually when you use "me", you're talking about being worried, and when you use "you", "he", "she", etc. you're talking about being related to something.