Blacklist:

• Frequent NSFW, more specifically images. (Occasional is fine, and warnings/tags are appreciated. FYI I often use twitter/tumblr in public.)
• Heavy alcohol/drug use. Tag/warning appreciated.

Less of an issue:

• Expect to be muted if you post a lot of spoilers of whatever without tagging.
• There are some ships that I hate. I don't care if you like them, but a warning nonetheless.