When Social Bookmarking
Bookmark only sites that you want other people to see. While some social bookmarking sites have privacy options, some people still tend to be careless when sharing bookmarks that they don’t really want to share.
Use tags wisely. In order to be a helpful source of bookmarks, choose and use tags appropriately.
Don’t be overzealous in bookmarking. Bookmark only sites and sources you think you and others will find useful and helpful.