Thanks - I will send along any examples I find. A suggestion might be to have another way to signal that a story is being artificially boosted besides 'flag'. For instance, a 'report' button where a brief description could also be attached (ex. 'This person posted this link to Facebook and asked their friends to upvote it').

The second part is good stories not ranking (see comment above), which doesn't have a straightforward solution, although it might sort itself out with softer, re-blog, and promoted stories being moved out of the way.