[onli]

More a side note, but if you run a blog you might know that the trackback url can be specified via a RDF tag. That's a kind of semantic information, one example for one type of usage: Given other clients (here: other blogs) additional information (here: where to send the Trackback POST).

The markup you added - it depends on what exactly you did. Did you add the markup for schema.org? That's in practice solely for Google. The SEO promise there is that Google will make use of the information provided and format some information nicely, which can lead to more clicks. https://moz.com/learn/seo/serp-features explains that not badly. For things like reviews I can imagine it to be quite useful.