uses social media.
Both "the social media " and "social media" are included as correct. However, I did that this morning... So, perhaps it was after you did the exercise. Thank you for the notification.
Κοινωνική δικτύωση; It's more like a noun that shows activity...
the drop-down hint for "δικτυα" is just "network" (it does not include "media"). And in the "write this in english" exercise with tiles, there is only a tile for "media" (not one for "network". It would be good to add "media" to the hints, I think.