What are "tag and share" icons?"
They are icons denomitaed "social bookmarkers". Pages that allow you to organize bookmarks, share links, classify, valuate and comment contents found on the Internet.
What kind of services they offer?
Facebook - is a social network where you can share information with friends and other users. You can configurate the privacy of the data yuou want to share and who can see it. You can share pictures, personal data, news, comments, links, etc.
Google Bookmarks - is the Google bookmark service. The links will be storaged in your Google account. You can access them from the Google Bar and from the google bookmark gadget at iGoogle too
Del.icio.us - is a social bookmark service. It allows you to add and classify by tags bookmarks. Its makes function of the clasic navigators bookmarks, but it has the advantage that you can see them from any computer, not only from the one you used to created, tagged and shared.
Meneame - is a web site based on the communitarian participation in which some users send stories and the rest of the users can vote. The most voted stories will be promoted to the main page. It combines social bookmarks, blogging and syndication.
LinkedIn - is a bussiness orientated web site. It can be compared to a social network service for profesionals.
Email Link - this icon allows you to send a link of all the sections of our web site from your regular email account. You have to have a mail application configurated.