I found a simple java-script which will tag your all your friends into comment section of selected post. Basically what this script does is to search all your friends, then automatically adding "@" sing before their name and the final result is to tag all your friends to the post. So that they will get notification that he has tagged onto the post!
Google chrome browser (You can also use other browsers but I will show you on chrome browser)
2. Post any status you want. Say "Hi buddies, I gonna tag you all !".
3. Get the direct link of your post by clicking on time stamp link. In below screenshot, it's 2 seconds ago. Click on it!
7. Copy and paste the below code into the field.
8. Hit enter.
9. The prompt will open displaying message as below. Just ignore it and click on "Okay".