Windows 8 Store apps deliver real time or periodic information to you as notification updates in the Start Menu. Every app sends information to you through the servers of Microsoft, which is then stored on your local PCs. However, in case you find this information to be nagging and you do not want to clear these updates, here is how you can do it in Windows 8:
1. Open up Metro Menu and Click on the Charms bar and select Settings
2. Click Tiles
3. Click on the Clear button under the Clear personal info from my tiles and you are done!