When you follow a community you get an email every morning with yesterdays new discussions. This is a convenient way to stay up to date with the Savvity communities you like.
There are two ways to follow a community. One is to open any discussion in that community, hover the mouse over it to show the controls, and click "Follow" above the headline. Then you can decide if you want to follow the whole commmunity or just new comments in that discussion. In iPad you just tap the post to open controls.
The other way to follow a community is to open a web address that look like this:
That will start your following of this community. Exchange "support" for the name of the community you want to follow.
You can stop following a community any time you like. Follow the link in one of the emails or go to your personal settings. There is also the possibility to visit this link:
Once again, exchange "support" for the name of the community you want to un-follow.