I should write it down here as I learned something totally new here today. This is purely SharePoint 2010 Administration and this will be helpful to many including me in future.
Part A: Including a Tag Cloud in My Site
Including a Tag Cloud webpart can be done in a normal way as we add in other webparts. But the Tag cloud will be empty if we dont have any pages/documents with tags. So we move on to adding Tags to Documents and Pages.
Part B: Adding Tags and Notes successfully to a Document.
To tag a document to show in OOB tag cloud webpart in SharePoint 2010
* Select a document which need to be tagged (add tick mark).
* On the top ribbon, you can find “Tags and Notes” . Click on that. Add the necessary tag.
* The tags gets mapped to the document. If a new document is added in the document library, do an incremental crawl.
Create a Seach Page by giving an appropriate name to it.
Part E: Modify MySite’s Search Center
In Central Administration, go to Manage My Site Page and update the Search Center’s location to the Search page that was created in Part C.