请教snsFlag字段含义

https://wx.qq.com/cgi-bin/mmwebwx-bin/webwxinit 这个请求中返回的数据中的`ContactList`中的用户信息中有个`snsFlag`字段, 请教一下这个字段的含义
```
{
...
ContactList: [
{
Alias:""
AppAccountFlag:0
AttrStatus:0
ChatRoomId:0
City:""
ContactFlag:0
DisplayName:""
EncryChatRoomId:""
HeadImgUrl:"/cgi-bin/mmwebwx-bin/webwxgeticon?seq=0&username=filehelper&skey=@crypt_a936502b_3bef572ce5dcabf9f7379f34d639f6b5"
HideInputBarFlag:0
IsOwner:0
KeyWord:"fil"
MemberCount:0
MemberList:[]
NickName:"文件传输助手"
OwnerUin:0
PYInitial:"WJCSZS"
PYQuanPin:"wenjianchuanshuzhushou"
Province:""
RemarkName:""
RemarkPYInitial:""
RemarkPYQuanPin:""
Sex:0
Signature:""
SnsFlag:0
StarFriend:0
Statues:0
Uin:0
UniFriend:0
UserName:"filehelper"
VerifyFlag:0
}
]
...
}
```

Start by examining the webwxinit response handling and searching the repository for SnsFlag or snsFlag references. Confirm the field's meaning from the available protocol behavior or documentation, then document a clear explanation of its purpose and values.

Written by the indexing model from the issue text.