If you are familiar with Digg, del.icio.us, or Furl - then you already understand the social bookmarking concept. If not, these sites help users to bookmark sites that interest them and share those bookmarks with other. As with anything, the success in one area can lead to others "leveraging" this concept in other areas. It seems that over the past couple of months several sites are using a "social" method for highlighting stocks and sharing with others. I thought it would be interesting to hear peoples' thoughts on these sites (the ones I am aware of - probably more): DigStock - most like Digg.com StockTickr - a little more personal portfolio centric, but similar to del.icio.us socialPicks - these guys are in Alpha mode, but you can generally get an invite easily