Review: HTC One S for T-Mobile
The S offers both individual and system-level messaging tools. The individual apps include the basic toolset from Android, such as Gmail, email, SMS, Google Talk, and Google Voice. These are all fine applications that continue to be useful for composing all sorts of messages. There aren't any other IM apps, so Google Talk is your only option out of the box.
In terms of social networking, the S offers integration with Twitter and Facebook within the OS. Sign into your social networking account and you can do things such as share photos, or messages from within other applications more easily. Twitter and Facebook are also both preloaded on the S as individual apps.
Other messaging and social networking tools include Google+ and Google+ Messenger, Latitude, and FriendStream. Each has its own widget or home screen shortcut.