How to index backlinks or your new website fast using GSA Search Engine Ranker – http://www.jsseo.co.uk
Extra explanation: The deeper reason why these strategies work is because these kinds of links are built on high-authority websites that are crawled on an incredibly frequent basis. Links in the descriptions of YouTube videos also work remarkably well.
Other than YouTube video descriptions, you can also use MediaWiki links. Bear in mind that these links don’t pass PageRank, but they do help your pages get indexed rapidly in Google.