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There are situations where you may want to keep users from changing their Activities I am following settings on their edit profile page as shown below.

 It is not exactly straightforward to do this and definitely not intuitive. This technique can be used to hide any section of the User Profiles on the edit profile page (i.e. Basic, Details, Custom Properties).

Steps

1. Go to Central Administration->User Profile Properties
2. Click on Manage Sub-types
3. You need to create a new Sub Type. It doesn’t matter what you put it in it. In this case you won’t be using it but SharePoint won’t let you choose not to show a section if you don’t have more than one. Create a new sub type as shown below.
    
4. After you have created the new sub type go back to User Profile Properties
5. Click on the Newsfeed Settings section as shown below and choose Edit
6. Uncheck Default User Profile Subtype and click OK as shown below.
    

That is all there is to it. You can do this with any section and you can have different views for different groups of users (like one for contractors and one for permanent employees).