The reason I love to use tag is...I can't do "search" for old webpage. Why? It's because I can't remember what sentence or keyword I have to use.

However, if I use tag to group, after a while I still can filter my search by that based on the memory that I might "define what tag I might input for it long ago". For example, my tag will look like "WebDesign-Design-Layout", "Web-Dev-tips", " Web-framework-javascript" "Networking-monitoring-tool" etc. From BIG-To-Narrow. So once the tag start sorting, I could still know which group I will look into.

Human's memory is limited. However, human can remember a paper/article's attribute/catalog which is been defined long ago. I use bookmarking service for so long. My experience is...in the end if people have a huge bookmark contents just like me, filter/tag/hashtag is way faster than search. If people don't define tag, they will just use google search for Webpage content, no need to use bookmarking service.

Knowing how to do the tagging and bookmarking is the key, after that, google search is no need.