The web is growing rapidly in a graphic sense and so the importance of relevance being attached to the presence of appropriate content on the sites other than just the text. There is a pointed to note that for blogs it is always good to include an image or two with the blog entries. A recent post at SEO By The Sea throws light on how metrics on community based tags are helping search spiders make more sense of images and relevance of web pages on the whole.

An excerpt from SEO By the Sea

There were a few rules followed in the process of clustering together photos from landmarks identified by tags from community members who took the pictures and uploaded them to Flickr. The authors tell us that the following assumptions were at the core of those rules:

(1) A cluster would contain photos taken from many different users, indicating that there is a broad interest in the subject shown in the photos,

(2) There would be some amount of visual cohesiveness in the images - in other words, people were finding the same things about the scenes at the locations interesting, with the same objects being photographed or the same type of photos being taken, and;

(3) The group of photos would be distributed relatively uniformly in time - showing that there was an interest in the landmark itself, and not a specific event that happened at the landmark's location.

Observing time-lines in the creation of tags and using that information along with the data obtained from keywords used by users and the actual images that they click on is a process that will get more refined as activity on the web increases.