what you know about the features of bad links?

1. Links to press releases.
2. Links to discussion forums.
3. Links to Other Country's Guestbooks.
4. Many Unrelated NoFollow Links.
5. Networks of Personal Blogs (PBNs)
6. Social Bookmark Links That Were Not Followed (Or Followed).

1. Low authority domain

         2. Repetitive links on same domain

         3. Relevance with the content

         4. Suspicious embedding of link in keyword anchor-text

         5. Reciprocal exchange