If you are trying to dodge your ex or avoid a certain friend-- there's an app for that!
It's called "Cloak" and the creator describes it as the "anti-social" network.
The new iPhone app figures out where your friends are using the geographic data from their Four-Square and Instagram accounts.
It determines if anyone is close to you and displays them on a map.
You can "flag" certain people you *really don't want to run into so you are alerted if they come near you.
And you can even select the distance so the app will notify you if your ex is coming within in two miles of you.