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"Tags" tab is missing when you open "Tags and Notice board" popup


Why does the Managed Metadata Service have to be running?


You might be wondering why it is necessary to have the Managed Metadata service application provisioned in order to use the social computing features? The reason is that the “tags” that users create when tagging pages, documents, list items, etc., get stored in the Keywords portion of the Term Store (which is the name of the central metadata repository that is maintained by the Managed Metadata service).

The Keywords portion of the Term Store is only half of the Managed Metadata repository. The other half is frequently referred to as the Taxonomy portion of the Term Store. The Taxonomy portion of the Term Store is hierarchical, while the Keywords portion is random. The master list of user tags gets stored randomly as they are created in the Keywords portion of the Term Store:
If the Managed Metadata service is not provisioned and running, users can’t use the social tagging features, because SharePoint 2010 has nowhere to maintain a master list of tags. One way to recognize that the Managed Metadata service is not provisioned/running properly is when your SharePoint site looks like this:
If you see this behavior in your SharePoint 2010 site, the first place to look is in Central Administration to verify that the Managed Metadata service is running.

One more point before moving on to the User Profile service application. I have been referring to the Keywords portion of the Managed Metadata Term Store as the place that SharePoint 2010 stores the “master list” of user tags. This is an important concept to understand, and here is a little more detail.

Each time a user starts to tag an item in SharePoint 2010, the Keywords portion of the Term Store is queried in real time to see if suggestions can be made to the user about previous keywords that other users have used. If a keyword appears in the list of suggestions and the user deems it suitable, the user can use it to tag the item. If not, the user can add their own unique keyword to the Keywords store and then it will be available for SharePoint 2010 to use as a suggestion in the future for other users.

So, the Keywords portion of the Term Store only stores one instance of a given keyword. That instance may be used by many users and many times as they tag items throughout SharePoint. Therefore, the Keywords list in the Term Store is truly a master list of unique keywords.



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