Slade drilled some pretty bad tendencies into Tara, not the least of which is this idea that she should be collecting information about persons of interest. Back when she was with Slade, he defined "persons of interest" as basically anybody; over time this impulse has dulled just to people she has involved conversations with. It's something she's trying to break herself from doing, but Slade had really, really effective teaching methods, unfortunately. So she still catches herself doing it from time to time.

The information she gathers isn't anything private and she doesn't actually have any hacking skills, so what she knows is limited to what she gets told or what she can see other people talking about publicly in a given post. She's not going to hunt down information beyond that, because she is trying to stop doing this so much. It's creepy and a gross invasion of privacy.

This is a short list of things she knows (or thinks she knows) about people she interacts with that they may or may not have told her themselves.

caesar zeppeli, glampop: uses something called the ripple. persistent. a little scary. doesn't know about your real powers but could probably figure it out. made of muscles. don't engage in a fistfight, don't piss off. probably a nice guy at his core.

cassandra cain, cassassin: probably a cape, probably with strong ties to Batman, knows one of Slade's aliases, knows (or at least is expected to know) several members of Batman's rogues gallery by name, knows the commissioner in Gotham, knows two of the possible known aliases for Robin; yeah, she's a cape, she just won't admit it yet. knows who the Titans are. incredibly fucking dangerous. be careful.

garfield logan, animalage: knows more about you than anyone here except maybe the government. too kind-hearted to actually do anything with it, but keep an eye on him anyway. he knows you've killed before. he might be too scared to tell anyone too much. maybe watch kid flash? they're roommates and friends and gar's a blabbermouth in every universe.

hazel lockwood, deadtective: lying about her powers in some way, lying about lying about her powers. hiding something big and doesn't want it to be found out. find out what it is. also, throws garbage at innocent people who are just trying to eat sandwiches. good person, probably, just a little bit of a dick A MASSIVE ASSHOLE. knows about your powers. probably trustworthy. more than most.

lapis lazuli, oceanthief: made friends with someone named Steven Universe, is an alien called a "gem" from Homeworld, hates Garnet and Jasper (probably the Crystal Gems), trapped in a mirror?, wants to "build her own prison", can't be hurt by anything on this planet, forced into war, coming here, crashing on Earth for a week because ♪ technically she's hoooomeless ♪, hey dorito hair, she's gonna hit the couch, you know where she be