Help with domain name

So… i'm starting a forum about a popular website/app. The site/app itself doesn't have a discussion forum, despite having many fans/users.
I'm struggling with the domain name. Let's say the site's name is 'Instagram', but because of legal infringement i don't want to use the site's name in the url (i can't use it, right?), and i will only use 'Insta'.
– i dont like 'forum' or 'forums' as a suffix or prefix.
– i prefer small names that aren't pointless, example: ourINSTA.com proINSTA.com or…
Help with domain name

See original post by evilfx