After Panda 3.9.1 - Updates -
There are some penalties and some changes in off page - Like
- Social bookmarks and other link submission strategies.
- You have to make genuine and ethical links with genuine content.
- Do not copy descriptions in various social bookmarks or any other link submissions taks.
- Only use copyscape verified content.
- Only use high PR - and Do follow submissions websites.
Its will help you to cover your ranking.
Let me know if you have any other queries.