She has social media but it's not managed by her. Her team manages all her social media accounts since she's a celebrity, and she probably posts an Instagram story every once in a while so people think she's the one using the account. But Briar doesn't really care about social media haha, she's the least chronically online person in the universe LOL

She uses her phone to message people (mostly Rose, Oleana, her manager, bodyguard... she doesn't give her phone number to many people because of security reason and also because she doesn't like people she's not close friends with texting or calling her 😭), do some research (her storage is mostly science book PDFs, research files, etc) and to take photos of her Pokémon and herself with her partners every once in a while.

Okay, thinking about it, maybe Briar does use her social media accounts (mostly Instagram) once in a blue moon. She would post a picture of her Pokémon doing something cute. And when her relationship with Rose was made public, she started to post some of her pictures with him. Actually Rose uses social media more than her, even if he uses it in a middle aged man kind of way lol 😭 he posts stories with Briar sometimes

Kinda answered Demie's question as an additive, but I'll make it slightly more detailed here.

Elio's general social media activity on his various accounts is as follows:

🔲The first quarter is basically foods he's tasted, given a very brief yet detailed and professional review on, and recommends to his fanbase - which became super popular over time due to his own popularity. A lot of restaurants and food vendors saw a major increase in their respective businesses because of Elio's reviews. So much so that Elio is unofficially recognized as an influential food critic on par with trained professionals, despite the culinary world not really being his thing.

🔲The second quarter are recorded battles, competitions, and other challenges he's taken - getting permission to record and post on his various accounts beforehand. Generally, said recordings are posted as reference material should he wish to revisit certain strategies that he's used and probably forgot over time to better improve either himself or his battling style. However, many of his followers have expressed their gratitude for these types of posts because they serve as excellent learning material - with certain aspects being implemented as a foundation to better themselves and their own battling styles to various extents, or they simply have a chance to see Elio either battle others outside of a professional setting or participate in other activities that entirely unrelated to battling - showcasing his other lesser-known talents.

🔲The third quarter are photos he's taken of places he's visited, albeit slightly edited for higher quality; 60% of said photos are him enjoying city life while the other 40% is him appreciating various aspects of nature - even if it's located in another dimension entirely. Furthermore, some of them have a caption, which ranges from his arrival to a brief description of the beautiful scenery he's witnessed at certain points.

🔲Finally, the last quarter is just stupidly unhinged (and according to a lot of his followers, insanely funny) posts that automatically blow up without it meaning to. While some may dive into discourse, others are just him venting his thoughts - which end up resonating with most of his followers and those outside of his fanbase. Elio's seen one or two of his posts being screenshotted and memed out the ass because of how it basically encapsulates a lot of given topics floating around on social media. For example, these (https://twitter.com/410VXYN/status/1511827636493950982?s=20&t=MSocPKjnrfU7p0zy9K0D1A) (https://pbs.twimg.com/media/FaUxpMVXgAAyv31?format=jpg&name=small) are two of those relatable posts that would be memed like crazy.

Phillip: Posting car stuff and general debauchery, no problem flexing his money, has to tone it down once he has to 'improve his public image'.

Polly: Typical Music Star Instagram stuff, but the non-corporately run kind of account. Lots of pictures with Ghost-types in the wild. Some Risque photos.

Sal: Foodposting account that takes off thanks to Ranae showing him how to run it, the cafe's Genesect waiter becomes a big draw. One day he posts a beach photo and suddenly his DMs blow up cause not only can he cook but he's built like a 6IV Machamp.

Wily:Initially something like 'Wilhelm29478103', the account randomly picks up steam once people notice this random, default profile pic account posting pictures of Genesect being repaired and other INSANE machinery("They just MADE antigrav shoes?"). Once people put it together that he's "The Landstein Kid" he starts getting flooded with messages from scientific publications.