Did Google penalize SAPE Links (another Link Network)?

Rumor floating around the SEO industry currently is that Google has crushed yet another link network, SAPE Links. Those using this paid service were supposedly penalized and downgraded in Google rankings over last two days. But not all webmasters agree it is the SAPE link network, rather they feel it may be a different network all together.

Dozens of threads are discussing about downgrades of Google rankings recently. Black Hat World and Black Hat Group have webmasters and SEOs who are hinting that it was due to SAPE Links. While others are not sure whether it is specific to SAPE or some other link network.

One webmaster wrote:
Anyone that use SAPE links see huge drop in rankings today?
Quite a number of Search professionals agreed but not all.

Google's head of search spam, Matt Cutts tweeted on 13 February 2013 that he was investigating "naughty Russian link selling software". And coincidently SAPE Links is a Russian link network.

@dannysullivan @seocom just another day at the office for me. :) Okay, gotta look at some really naughty Russian link selling software now.
— Matt Cutts (@mattcutts) February 13, 2013

Suggestions for Search Professionals and Webmasters:
Always avoid getting back-links from Link Networks. They may seem easy to get and can bring good Search Engine rankings early. But Google is all set to fight spam and low quality sites. Search Spam team of Big G cracks on culprits and penalizes and downgrads them in Google rankings. Always prepare unique content and get related quality back links. That will lead to top rankings in SERPs and qualified traffic.