@mariusor
The earliest discussions on Activity Streams did constantly get stuck on which platforms' concepts were "real" and which was just an alias for another.
e.g. is a "tweet" the same thing as a blog post? As a status update on Facebook?
e.g. is listening to a podcast the same verb as watching a video on YouTube?
e.g. is "liking" the same verb as adding to a "Favorites" playlist?
In retrospect I think it was naive to try to be so specific, since it was too early for that, but alas. 
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