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I find the question and the answer misleadin at least, as far as I know Confluence 3.5 and Jira 4.4 do not support Gravatar at all. If these were added later it should be specified too. Also the question is far too broad as th atlassian product range is huge.
Here's a few tips for using Gravatar...
Pictures are served via an email Hash, so pictures are unique to an email address but people can't reverse-engineer your email address from the Gravatar URL.