At some point you might wanna delete all the tags\notes for a specific user in Sharepoint 2010 site. To help with that in this post i have laid out detailed steps about how to do that and also about deleting all tags or notes for a particular date range.
To delete all tags or notes for a specific user by using Central Administration
1. Verify that you have the following administrative credentials:
* To use Central Administration to set up My Site Web sites, you must be a member of the Farm Administrators group or a Service Application Administrator for the User Profile Service application.
2. On the Central Administration Web site, in the Application Management section, click Manage service applications.
3. On the Manage Service Applications page, click User Profile Service Application.
4. On the Manage Profile Service page, in the My Site Settings section, click Manage Social Tags and Notes.
5. On the Manage Social Tags and Notes page, select the type of social item that you want to delete from the Type list.
6. Either type a user name in the User box, or type the first part of the URL for which you want to delete all notes or tags in the URL box, and then click Find.
7. Select the social items that you want to delete and then click Delete.
To delete all tags or notes for a particular date range by using Central Administration
1. Verify that you have the following administrative credentials:
* To use Central Administration to set up My Site Web sites, you must be a member of the Farm Administrators group or a Service Application Administrator for the User Profile Service application.
2. On the Central Administration Web site, in the Application Management section, click Manage service applications.
3. On the Manage Service Applications page, click User Profile Service Application.
4. On the Manage Profile Service page, in the My Site Settings section, click Manage Social Tags and Notes.
5. On the Manage Social Tags and Notes page, select the type of social item that you want to delete from the Type list.
6. Either type a user name in the User box, or type the first part of the URL for which you want to delete all notes or tags in the URL box and then click Find.
7. Enter a start date and an end date in the Date Range boxes and then click Find.
8. Select the social items that you want to delete and then click Delete.