No, not currently.
Diaspora/Diaspora
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Since version 0.7.0.0, yes! You can mention someone in a comment the same way you would do it in a post, by typing “@” and then start typing their name. Please note that when you comment on a post which is not public, you can only mention users who have already interacted with the post.Since version 0.7.0.0, yes! You can mention someone in a comment the same way you would do it in a post, by typing “@” and then start typing their name. Please note that when you comment on a post which is not public, you can only mention users who have already interacted with the post. 
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I have a question here. is it the users that "already interacted with the post" (here I understand that as commented/liked/reshared it) or the users whom the post is available(they have access to it)? 
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The former, since the latter would be an information leak that's bad for the author (all members of it can figure out what the author considers one peer group/aspect) and for the other recipients (all recipients can start mapping FOAF graphs). 
History
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No, not currently.No, not currently.
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No, not currently.No, not currently.No, not currently. 
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Since version 0.7.0.0, yes! You can mention someone in a comment the same way you would do it in a post, by typing “@” and then start typing their name. Please note that when you comment on a post which is not public, you can only mention users who have already interacted with the post.Since version 0.7.0.0, yes! You can mention someone in a comment the same way you would do it in a post, by typing “@” and then start typing their name. Please note that when you comment on a post which is not public, you can only mention users who have already interacted with the post.Since version 0.7.0.0, yes! You can mention someone in a comment the same way you would do it in a post, by typing “@” and then start typing their name. Please note that when you comment on a post which is not public, you can only mention users who have already interacted with the post. 
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Since version 0.7.0.0, yes! You can mention someone in a comment the same way you would do it in a post, by typing “@” and then start typing their name. Please note that when you comment on a post which is not public, you can only mention users who have already interacted with the post.Since version 0.7.0.0, yes! You can mention someone in a comment the same way you would do it in a post, by typing “@” and then start typing their name. Please note that when you comment on a post which is not public, you can only mention users who have already interacted with the post.Since version 0.7.0.0, yes! You can mention someone in a comment the same way you would do it in a post, by typing “@” and then start typing their name. Please note that when you comment on a post which is not public, you can only mention users who have already interacted with the post. 

