With all of Google's reiterating lately about 'If you build content, links will come' I'd tread carefully here.  Better to create stellar, link worthy content that earns traffic on its own.  Plus, with all of the concern about passing page rank, many bloggers are moving toward nofollowing.

Create awesome content, market cautiously, analyze what gets traffic and what doesn't.  Refine. Rinse. Repeat or Adjust accordingly to what your audience wants and needs.

That said, myblogguest.com, is a community of guest bloggers featured by noneother than Moz, Search Engine Land and BlogHer.  Looks like it's kind of a 'dating site' for blog content.

Good luck!

We see this too.  We have canonicals in place, and we still see the error.  And there's no insight into which parameters are causing issues.

I think we all know by now that buying links never bodes well.  It's not sustainable and if Google catches on it could hurt worse than being patient.

Definitely submit a sitemap, and work on your long term social media strategy.