In a note to Slide users in Turkey, Slide announced that it has contacted the Turkish government in hopes of resolving the issue:
If you use Slide in Turkey, you've probably noticed that you are no longer able to access the Slide website or our applications (you may not even be able to access this post). The Turkish government has accused Slide of “harboring pictures and articles that are considered to be insulting to Ataturk,” founder of the republic.
We have contacted the government of Turkey in an effort to resolve this situation and will keep you updated on any changes. In the meantime, we're trying our best to enable Turkish citizens to access our website and applications again.
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