Crete island has 4 regional units/municipalities
https://www.incrediblecrete.gr/municipalities/
REGIONAL UNION OF CHANIA - Municipality of Chania
REGIONAL UNION OF RETHYMNO - Municipality of Rethymno
REGIONAL UNION OF HERAKLION - Municipality of Heraklion
REGIONAL UNION OF LASITHI - Municipality of Agios Nikolaos
Crete visitors use a variety of hashtags when they post on Instagram, however it will be characteristic to have some statistical information about how many are used per city (we will be looking for the 4 major cities and their more ‘official’ names)
CHANIA
https://www.instagram.com/explore/tags/chania/
#chania
788,711 posts
Heraklion
#heraklion
373,168 posts
Rethymno
https://www.instagram.com/explore/tags/rethymno/
(It is worth to mention that a significant amount of users (but less than the below) post under the tag #rethymnon )
#rethymno
250,318 posts
Agios Nikolaos
https://www.instagram.com/explore/tags/agiosnikolaos/
#agiosnikolaos
122,212 posts
And what about #Crete ?
Well, an impressive number of more than 3 million posts uncover when you click the below link
https://www.instagram.com/explore/tags/crete/
#crete
3,850,874 posts
And it is worth to mention that #aboutheraklion has more than 800 mentions!
#aboutheraklion
883 posts
Why I am posting this?
Because I have created the community 
Feel free to follow my account on instagram or on facebook too!
https://instagram.com/aboutheraklion
https://www.facebook.com/aboutheraklion