Nicole Simon posted a request on FriendFeed for a bookmarklet that would search for the selected text on a page, so you could find who posted it first on FF.

I tried posting a reply on FriendFeed, but the comment kept breaking the url, so here it is again.  Drag this link onto the browser toolbar & it’s all yours.

Find on FriendFeed.

Best thing though is that Aviv posted a comment saying that this will soon not be needed:

No need for a bookmarklet… a "Find others" button is coming ;)

Sweet!