What to add?
Any article (it can be news, opinions, reviews ...) on the web that you find good or useful and want to share with everyone. Add the title of the article, few lines (snippet) from the article, and the article's URL.
Why should I? or how it helps?
There can be many reasons. You may like the article, you maybe passionate about the author, you may have got impressed about something in the article. By adding the snippet of the article to WebYAM with right set of tags, you are making life easy for people who just want to know about or keep track of or interested in the topic (i.e. your tag text). For e.g. if you tag your article snippet with word "Vegetarian Food" then your snippet will appear on WebYAM's "Vegetarian Food" page (i.e. webyam.com/snippets/vegetarian-food.html).