I have been out of of the SEO game for 6-7 years, with most of my 30+ static sites surviving, some thriving with natural traffic. There were ups and downs probably due to penguins or pandas; but I had chosen to ignore them, and all seems more or less normal now.
I still have one or more websites which simply deserve to be better known. My assistant is suggesting the following tasks:
1) Link exchanges
2) Blog comments (of course, manual and relevant only)
3) Forum posts with signature in relevant forums
4) Write and publish unique articles in blogs / article sites, with links to my site.
What is the latest policy on the above? - Isn't it totally passé and useless; and maybe even potentially dangerous?
If so; what else to do to safely promote a website? E.g. how would I go about using social media to promote a simple site?