Automatically republish old posts

http://wordpress.org/extend/plugins/oldest-2-newest-redux/ it takes your oldest post and reposts it in the front every 24 hours, but you can change the hours on the php file in the plugin folder not sure if this is what u are looking for.

Portfolio + Blog: multisite or plugin?

Set your blog as Blog category and your portfolio as Portfolio category. You might be also interested in Custom Post types (which I think is the right way to do it): Run your Blog as a usual via Posts and set the Portfolio as Custom post type with its own categories, tags or what ever … Read more

Facebook Share Thumbnail

You need to add Open Graph meta tags to your <head>. See og:image below… <meta property=”og:title” content=”35% of LinkedIn Users Check The Site Daily” /> <meta property=”og:type” content=”article” /> <meta property=”og:url” content=”http://therealtimereport.com/2011/08/05/35-of-linkedin-users-check-the-site-daily/” /> <meta property=”og:image” content=”http://therealtimereport.com/wordpress/wp-content/uploads/2011/08/LinkedIn-Users-Are-Highly-Engaged.png” /> <meta property=”og:site_name” content=”The Realtime Report” /> <meta property=”og:description” content=”Now the No.2 ranked social networking site – as of … Read more

Dynamic carousel on individual posts

You can use WordPress built in gallery, see Gallery Shortcode. If you look for the gallery shortcode function in WordPress core, you can see how it grabs the image attachments to a post with get_children and outputs them. You can use this as a starting point to write your own function to output the gallery … Read more