Remove Social Tags Ribbon Control

If you want to remove "I like It" , "Tags & Notes" Then just follow these steps :

1. Open Central Administration
2. Click on System Settings
3. Click on Manage Farm Features (_admin/ManageFarmFeatures.aspx)
4. Deactivate the Social Tags and Note Board Ribbon Controls

OR You can deactivate this feature by Power shell command :

SharePoint 2010 Management Shell

Disable-SPFeature –Identity SocialRibbonControl