There's been so many times when i've gone online only to not know which of my online friends are ready to join me or are busy. what i've done so far is send them invites usually labeled "Do not accept invite - [insert message here" and then i have very limited character space.

I would love maybe like- a phone, or maybe just a send message button where i can send someone a message, maybe attach an image, and then send, then they can get back to me and tell me whether they can join or not, why they can't, etc.

i'd really love to see a chat function like this implemented.