I usually build links to my backlinks as well that way i improve the strength of my backlinks.

When you create certain types of backlinks, Forum profiles, article submissions, web 2.0 submissions you are creating a new webpage that has not been indexed and has no page rank. You want to ensure your backlinks are found and you want to make sure you boost them a bit so you can get some decent link juice out of them.

A very simple way to do this is to backlink them using blog comments.

Look for blog posts that are already indexed this can be don by scraping their urls from google , if you have scrapebox that will be very useful.

Since the blogs you will be commenting on are indexed already google will find your links with relative ease.

Note though some of these blogs have not been crawled in ages so you might want to get google to recrawl them by pinging them.

Do not ping a boatload of URL's at once you are just gonna be shooting yourself in the foot, instead ping like 10 a day e.t.c if your site is already established and gets quite a lot of daily links then you can ping all at once.

Hope that helps.

link wheel is much effective, actually i am going to do a practice on Link Wheel.

will share experience soon....