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One can find free RSS icons from the following sources: Feed Icons, RSS Icons (animated), Glossy RSS Icon, RSS Dock Icon, Mycircles RSS, RSS With Reflection, Feed Icons2, Acid RSS, Ojiggo RSS, Grudge Style RSS Icon.
RSS is built of XML and is a method to receive feeds with a RSS Reader
RSS was created in 1999.
By defult in the right side widgets are there will be RSS Feed
So the feed of your tumblr blog rss will be available from the RSS Feed link