In the version 4.2 ( which can be downloaded from here ) more emphasis was given more on how users can communicate ,share the maps with each other using SMS or Email on the go. I wish there was a way that shared link could have been launched in the Local Google Maps directly.
It is also possible that you can make a call to that location if there is a phone number associated with it. Sharing is only via SMS or Email and I do not see any integration made when native application of Facebook or Twitter is installed on your mobile.
Offcourse there is a integration with Google Buzz and you can share photos, comment if you are signed in your Google Accounts.