First of all, when you downloaded and installed Jitterbug, you probably allowed the app to access your cell phone address book requirements, and WeChat you also allowed access to cell phone address book requirements, both of which allow access to cell phone address book requirements, naturally, Jitterbug and WeChat will synchronize the address book, access to the same information and the same friends into your big data. Secondly, Jitterbug has not set a private status, and you will leave traces when you watch Jitterbug is casually retweeted and shared with your WeChat friends, making the big data tracked to your WeChat friends and address book. If you want to disable Jitterbug from accessing WeChat's information, you can set Jitterbug to private, or you can remove the requirement that Jitterbug allow access to your address book from your phone's settings.