I post my art multiple places including tumblr and twitter, both of which you can easily get the codes to paste the image from, but to be honest I use deviantart the most. It's nice in that it's an art specific community, so if you're looking to get some exposure and possibly a following you likely will.
But even for non-art things or things I don't necessarily want to show all my watchers but I do need a link to, their sta.sh feature is pretty convenient.

Hmm... The sites I tend to use for my art are as follows:

Twitter, Furaffinity, ( I do not recommend this one. ) Gitlab, Imgur, Discord ( Not really a site but I upload a lot of art there and link to it. )

Imgur or Twitter would probably be your best bet, though Twitter seems to be removing transparent PNGs from their site, so keep that in mind.

Honestly when I don't use Deviantart, I use the DA Stash lol.

i post images in a private discord and link to it

I used to use imgur extensively, but I've been using imgbox as a replacement, since the imgur terms of use forbids its users from hotlinking its hosted images to many websites and I just don't want to run the risk. More recently I've been posting images to a private discord channel and just grabbing the image link from there!

I generally use Tinypic. Doesn't delete pictures you've saved from ages back, and is easy to get the type of link you need. Only downside is that there are popups sometimes. But I haven't found any alternative that actually works well compared to it.

Yeah, dreaded TinyPic when you look at old stuff. Always seems to be deleted after awhile.

Imgur is good for any type of image.

Twitter, Furaffinity, Deviantart, and maybe Tumblr are good for organizing your art. Furaffinity and Deviantart have folders to help organize your stuff. Twitter has moments to compile your art. Tumblr’s tagging system is a bit wonky, but it may work for you.

I have my own personal website that I upload and host images from for maximum image control, but if I'm really lazy I use a screenshot app (Greenshot) that lets me upload to Imgur directly. Pretty helpful.

Personally, I don't recommend Twitter and Discord as they compress images pretty awefully. Twitter turns things into a compressed jpg, and by Feb I believe, you won't be able to use the 1 transparent pixel to force your image to upload in good quality png. Discord sometimes distorts colors post compression, often on CMYK images, which I almost always use since I work on publishing prints. Generally, people work with RGB and converting takes a few secs, but imo the color distortion kinda speaks about Discord's upload engine.

I haven't had much issues with Imgur, and image compression isn't too bad if I notice it. Mostly, it's convenient since it's partnered with a number of screenshot apps.

I don't do a ton of social media with my art, but lately I've been using Imgur. It's pretty convenient and easy-to-use. It's also quick to link items elsewhere, which is useful if I want to share or post my art anywhere else.