I wanted to offer one bit of advice because we're all guilty of doing this. I've done it too so don't think I'm trying to be righteous.
If you follow a webcomic writer on social media and see that the writer is posting an update, please click on the link to the webcomic site itself. Contributing to the traffic is a free way to support the writer and the comic looks significantly better on the website it was made for especially if you're only getting a preview pic. It's win-win.