I'm not sure what do you mean, since AFAIK they don't have any "native" chat, everything is cross-chat ? Write only ? Contact-centric would be a nice goal,

I'm not sure what do you mean, since AFAIK they don't have any "native" chat, everything is cross-chat ? Write only ? Contact-centric would be a nice goal, but the best you can do is probably Android-style "Contacts" ?