Welcome to the Q&A Forum

This used to be recommended years ago when Google didn't have the crawling power they do now. Today Google does regular crawls everywhere, it is possible that submitting the URL may gain a day or so advantage, it just depends on how often Google crawls the particular site you acquired a link on. Obviously the more popular the site the more likely Google does frequent crawls.

Google just rolled out Penguin 3 so if you have a dubious backlink profile you will most likely have been affected.  You may want to look at cleaning up your backlink profile to get back on track. More info on the update here: http://searchengineland.com/google-penguin-3-0-worldwide-rollout-still-process-impacting-1-english-queries-206286