tedster - 9:53 pm on Jul 2, 2011 (gmt 0)
nothing to prevent people from sharing and recommending by any means of their choice
And socially savvy sites can make that easy to do in many ways. If you have user comments, let there be a url that takes a link directly to a specific comment, for instance. Make sure any scripting/AJAX doesn't offer any URL confusion for naive sharing, and so on.