Subscription to tags

[tomitheninja]

Currently, tags are not often used.
In my opinion there are way more possibility in them, we see and use.
As in #231, we are already creating virtual groups/circles, by using the tag on them.

I think, if we want the users to take the effort to tag the groups, we will have to provide more features on them.

The first use idea, that came to my mind was to notify the tanulosch members of the college circles, when a new group is created to which they are subscribed.

Currently I can think about two possible implementations of the notification system.

• send an email with the details of the group and an unsubscribe button.
• send a mobile push notification and user's can delete watched tags under their own profile.

We should provide autocomplete so there is only one variation of each topic. (buying-apple apple-shopping and Apple-shopping should be the same thing)