I purchased a new site 4 months ago. Started slowly adding quality content and trying to buy services that wouldn't hurt my rankings. At the beginning I paid for a bookmarking service for various urls. Some one of them went up whilst others got sandboxed probably (not to be found in the 50s). How is this possible? I used various anchors and my linking techniques for every url were very similar at the beginning. Since then I've been trying to continue building links to the "sandboxed" urls to get the rankings back but they're not moving. Why is this so random? Thanks!