This definition and page is both unclear in and of itself, and how it relates to the IndieWeb. If you understand "seenthis", please help fix this page! - Tantek 19:06, 21 February 2015 (PST)
From there website:
"Short-blogging with no text limit. Curation and web survey. Cool automatic text layout. Forums under each post. Advanced and automatic thematisation."
There is a nice article that describes deeper how it works by Thibault Henneton: fr Au fait, c’est quoi SeenThis ?