Thanks for sharing for important informaion.
jaskeen kaur, Thanks for sharing good information.
opensiteexplorer, backlinkwatch
Social Bookmarking is not totally dead. It is good tool of off page SEO to promote website.
Twitter.com, USA.gov
On page and Off page Both are effective for the SEO.
Ahrefs, Majestic SEO, Open Site Explorer, Backlink watch and many more...
I think Directory submission, Social bookmarking, Blog commenting, content sharing and forum signature links are still helpful to get high rank.
I think 1 to 2 link you can put in a articles.
30-40% bounce rate is good.
My successful strategies are; Forum posting Article posting Web2.0 Blogs Guest Blogging Social Bookmarking
Facebook
youlikehits.com and twiends both are good..
Separate names with a comma.