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Does this plugin work with WordPress MU?

This plugin works with with version 3.0 of WordPress in single- and multisite-installations. So, yes - it works with WPMU version 3.0 and newer.

Do I have to save an extra feed-URL along with each of my bookmarks?

No, since version 1.1 of the plugin, this is no longer necessary. The plugin is able to discover the feed-URLs automatically. However, it's still possible and the plugin would use a separatly saved feed-URL.

Can the bookmarks be ordered by "last updated" ?

Yes, by using JavaScript. The visitor's browser will perform the sorting. Just enable the plugin's JavaScript-sorting option.

Does the plugin access the remote blogs and their feeds directly?

No, the plugin adds JavaScript to your blog that accesses Google and the copy of the feed Google has stored on its servers. Google will be accessed from your visitor's browser.

Will the pageload of my blog be affected in a negative way?

Yes, depending on how many bookmarks you have in your blogroll, you will notice a longer pageload. The plugin will generate a javaScript, which executes in your visitor's browser. It will load the update-infomation from Google. This does not affect the traffic between your blog and the visitor.

Are the links visible to search engine crawlers?

Yes, they are.

Does the plugin support link-categories?

Yes, if you created link-categories, you will be able to group your bookmarks by these categories. On the plugin's option page, you will even be able to order the link-categories customly with drag-and-drop.

The plugin relies on JavaScript, has it been tested to work with the common web browsers?

It has been tested. It is known to work with the following web browsers:

• Firefox 3.0 and newer
• Apple Safari 3.2 and newer
• Microsoft Internet Explorer 7 and newer
• Microsoft Internet Explorer 8 beta
• Opera 9.51
• Opera Mobile 9.51
• Opera Mini 4.2
• All versions of Google Chrome
• SRWare Iron 1.0 and newer

Microsoft Internet Explorer version 6 and older are unable to display the Feed Reading Blogroll properly.

What can I do to boost the performance?

You can do a couple of things.

For starters, I recommend to save the feed-URLs within your WordPress linkmanager. How to do this is described in my manual.

Furthermore, I recommend to additionally install the following plugins:

• Autoptimize - It concatenates all scripts and styles, minifies and compresses them, adds expires headers, caches them, and moves styles to the page head, and scripts to the footer. It also minifies the HTML code itself, making your page really lightweight.
• W3 Total Cache - This plugin combines static page-caching and a database cache. Can be integrated with opcode-caches like eAccelerator, XCache or APC.

Additionally, it may be a good idea to divide your bookmarks into a couple of categories. Afterwards you could add Social Blogrolls for only some of these categories and normal non-social blogrolls for the rest of them.

This idea can pursued even further with help from the plugin Widget Logic. Widget Logic allows you to place sidebar widgets only on certain parts of your blog. For example, you can add a social blogroll only on your homepage and prevent it from being shown on articles and pages.