You can Chat (just like text messaging) with any of your Connections or you can send an initial Chat (Send Greeting) to any user you are not connected to from their Profile. In the case of an initial Chat (Send Greeting), if the user replies to your Chat, then they automatically become a Connection.
Within Chat (or initial Send Greeting), you can:
Send a text message
Send a Song
Invite to an Event
Invite to a Concert
Invite to any Place
You can send any of these three items individually as it’s own Chat message or you can send any of these three items together in one Chat message.