best practice to use TouchableNativeFeedback.Ripple is to check the api version of devices first, because this background type is available on Android API level 21+.
import { Platform } from 'react-native';
<TouchableNativeFeedback
onPress={this.follow}
background={
Platform.Version >= 21 ?
TouchableNativeFeedback.Ripple('rgba(0,0,0,.2)', true) :
TouchableNativeFeedback.SelectableBackground()
}
>