That’s a good question. The Wikipedia page for Meme has a good description if you want more details. But basically, a meme is an idea that spreads quickly through culture (or at least through some subset of a culture).

Some pop-culture examples of memes are catch phrases like “Show me the money!”, or music videos like the treadmill choreography for that “Okay Go” song, “Here We Go Again“.

Blogger culture often has its own memes that people outside of blogging probably wouldn’t understand, such as the ones I mentioned above, or odd things like I’M IN UR [noun] [verb]ING UR [noun] and I CAN HAS CHEEZBURGER?.

This plug-in comes from R.B.Boyer (http://chaotic.nexusvector.net/archives/2005/01/16/wp-tags/) and i’ve modified it adding tag intersection (i.e ia+folsonomies del.icio.us style). You can have a look on my blog.

It uses WP custom fields and permits tag creation on the fly, hierarchical listings of current used tags (with a lot of options), list of tags for the current post but it lacks a real “suggest the best/related tag” feature based on Javascript or Ajax.

Emanuele

Anne: you’re right. I was thinking of the other versions of RSS. But RSS 1.0 does have some shortcomings. However, Atom seems to cover the bases pretty well. I really don’t know why we need a new version of RSS.

Alex: WP categories can be used as tags. However, unless you modify the base system (like with the plugin I’m using), you must define your categories ahead of time. The difference between “tags” and “categories” in this case is that you can create tags on the fly, without any forethought, whereas you must create categories before you publish your post.

Dougal Gunter: It took me a few minutes to understand what problem this is addressing. Basically, the idea is that we want a more user-friendly experience when people click on RSS feeds in their web browsers.