Some re-hashing of old advice:
URL Shorteners.
Don't use them, don't click on shortened links.
Yeah, thy can get you under that 500 character limit... but at what cost?
They can be used malevolently: a writeup espousing something great, but a link to a nefarious site ready to install a bitcoin miner on your system.
And don't use them, because we don't know that they aren't malicious, and won't click on them.
Follow
^^ that being said, there are security experts that take this too far.
URL shorteners and QR codes have a fairly valid place in the world.
A "contactless menu" at a restaurant.
An ad on TV.
A flyer from your kid's school.
They've all probably been vetted.
But a link from an internet stranger? A random sticker at a bus stop?
No.