Dark pop is fag tag - I don't know how people can tag Melanie Martinez, Lana Del Rey or Natalia Kills as this. :v Dark should be used if music atmosphere fits this "dark", so it's more like synthpop / futurepop. (mind.in.a.box with its "Lost Alone" can fit it not bad)
well natalia's music isn't exactly happy go lucky, bubblegum beats. The same goes for the videos.  It's for pop music that uses more sinister lyrics & beats to create a much 'darker' atmosphere than standard pop music.  and natalia kills is dark pop, not all of her songs, but a great a part of it
Natalia has said herself that she makes regular pop music, but most of the people find it as 'dark pop'. In my opinion, I don't see anything wrong with it as some of her songs are pretty dark because of their atmosphere and lyrics. 
Why is it that for every tag, video or whatever there's always some smartass bastard who has to leave a negative comment? As far as I'm concerned this tag is ok as well as the artists here. If you don't like "dark" pop or something don't click the tag!