How Does Go KIK Work With Connecting You To People?

Ok so I have Iphone 5 and Kik on it. There's this girl I Use to talk to 5 Years ago! I don't know how she got in my Kik messenger box she sent me quote on quote ''Hey Sup? '' And I'm there with this Face Expression O-o… Any one know how they connect you with people You use to talk to? And i just got a Kik and she was like the 10 th person i kiked. Thank you for helping!

Added (1). Btw. Her number was not in my phone i'm not her friend on facebook and I don't follow her on twitter or anything! I haven't talked to the chick in 5 years!

If her number was in your phone, or your phone was synced with Facebook/Twitter, and was on one of those social networks as a friend/follower of yours them that's how. I asked myself the same question when I first started using my Kik. Or, they can search your username.