A quick tip by Matt Cutts on his twitter Account

[BloodMaster]

Check out what Matt Cutt's have suggested concerning the recent updates hit...
For the second one.. the complete URL is - https://support.google.com/webmasters/answer/158587?hl=en

 

[DavidB]

Hello sir ! This is really a nice information. But what you think will it also be helpful to reduce the effect of negative SEO for our site?

 

[BloodMaster]

BloodMaster

Yes I think so, It is much helpful to reduce the effect of negative SEO on your site.