feisbuke

In a sentence

• Aš rašau žinutę draugui feisbuke.

  I am writing a message to a friend on Facebook.

  In this sentence, 'feisbuke' is in the locative case to indicate the location where the action (writing a message) is taking place, i.e., on Facebook.

• Matau daugybę įdomių nuotraukų feisbuke.

  I see many interesting pictures on Facebook.

  Here, 'feisbuke' again uses the locative case signifying the platform where the interesting pictures are visible.

• Feisbuke visada galima rasti naujausias naujienas.

  On Facebook, it's always possible to find the latest news.

  This sentence uses 'feisbuke' in the locative case to emphasize the source (Facebook) where the news can be found.