By default, the Landing will send you emails if people comment on your posts or post things to groups of which you are a member. It is possible to set this so that you receive no notifications at all, or you can avoid emails and get notifications delivered to your message box on the Landing so that you only see them when you log in (look for the mail icon on the top bar - it tells you if you have messages waiting)

You can change this to suit your needs by selecting 'My Account' from the toolbar. From there:

• select Notifications for fine-grained control over whether you receive email notifications when people comment on your posts, or the people you are following post something.
• select Group Notifications to do the same for groups you are a member of.
• select Comment Notifications to control whether and how you receive notifications for discussions that you have participated in by commenting on someone else's post or engaging in a group discussion. By default, whenever you make a comment on someone else's post, the Landing assumes that you would like to be informed of follow-up messages and will notify you when someone else posts a comment, but you can turn this on and off for each conversation or, if you prefer, use the settings here to set site-wide defaults.

George Siemens has recorded a short tutorial on turning permissions on and off at http://tinyurl.com/2vvlchc