Backlinks from a site with low quality content and PR. Google wants if you are going to have backlinks they should be of good quality not just getting backlinks for the sake of getting ranked better on search engines.
If you are posting your content and Article to irrelevant categories and websites . surly its will affect on your keywords Ranking . be posted in relevant sites and choose correct categories on your website
Back links from the spam blogs and article websites.
The anchor text which manipulate the guidelines of the Google.
Excessive and reciprocal links from the spam directories and spam social bookmarks websites.
They tend to hate link injections, which are blog comments that are spammy as well as forum signatures. People don't realize that this seriously hurts their ranking in Google. They are paying to have their site become worse in the SERPs...
Re : Backlinks types that Google hate –
04-15-2014,06:03 AM
Google hate backlinks generated through paid links, reciprocal links, low quality directories and bookmarking sites, links on the footer of various website etc.
Types of backlinks types that are not liked by google are -
Duplicate Or Copied Content
Automation of Content Creation
Distribution of Viruses, Trojans etc
Title Sacking