The bookmarking plugin was bundled with Confluence until Confluence 4.0
You can still download and install the plugin in 4.x however.
As of today, you should be able to install it using UPM if you're using < Confluence 4.1.1
If you're using 4.1.3, you can still install it manually using the "Upload Plugin" option in UPM and using the download link here:
The note about it being removed from 4.0 is here:
http://confluence.atlassian.com/display/DOC/Confluence+4.0+Release+Notes#Confluence40ReleaseNotes-ReleaseNotices (Feature removed from Confluence)
Do you mean the Social Bookmarking Plugin (http://confluence.atlassian.com/display/CONF35/Working+with+Bookmarks) ? This was deprecated as core functionality from Confluence 4.0 onwards, but is still supported and is now available as a free plugin at https://plugins.atlassian.com/plugin/details/192
Hope that helps,
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