Just to add to the confusion, as well as the "chiclets" often used for social bookmarking, there are also those which display names like "MyYahoo", "MyMSN", etc. These have a specific purpose too and should be included if you want to include the whole panoply of surfer "services".
The point of these is - for surfers who use a home page such as MyYahoo - is to allow, via a single click, the output from your blog's RSS feed to be added to their home pages. The link format (this example for MyYahoo) is
http://add.my.yahoo.com/rss?url=http...main.com/feed/