Selected answers from the Dumb SEO Questions G+ community.
Jim Munro: Others might disagree but I think guest posting was a dumb idea from day one. Consider that putting the same amount of effort into your own site might be more beneficial, particularly long term.
Aneeza Sehrish: To be honest I agree 100%.. I guess if the piece of content is quite catchy on your site there is a big chance that you can catch the big fish with an authoritative link rather than getting links from useless sites.
James Andrews: Cold emailing works. So does contact form marketing. In fact contact form marketing works better than emailing for this. I use https://www.paighambot.com for this..