Love the premise but the flaws make it impossible to use. I was initially excited about them able to earn points for sharing as well as commenting but unhappy that they didn't get points for posting.
I also wasn't happy with people mysteriously getting thousands of points in a day for doing very little.
I could have lived with most of the above except for the fact that it makes my site take several seconds longer to load and if the captain up website is down, which it was several times last week, it keeps my front page partly loaded for close to a minute before it finally acknowledges it can't load captain up and continues to load the page without it.
I am losing way too much money being crippled and unable to load for such a long period.
I may come back to it should they change it where my site isn't dependent on their site loading to work.