My 14 year old DD has a really busy social life - rarely a day goes by without her heading out to meet various friends. She is a member of Rangers (GG), so does meetings, camp and activities with them, goes paddleboarding, meets friends in town for shopping/lunch/mooching, has done a week of a drama course which she usually goes to on Saturdays in term time, hangs out at the local park, goes swimming, to the cinema, one evening a week is the LGBTQ+ youth club and she occasionally meets some guys to play Dungeons and Dragons. Like I said - she's busy!
DD2 is 12 and a totally different story. She's much more of a homebody and prefers my company to most others (which I am enjoying for as long as it lasts!) She probably does have too much screen time, but she spends hours on facetime with her friends. She plays online games with people she knows (The Sims and Minecraft), watches episodes of Friends, over and over again. She does meet up with friends a few times a week for sleepovers, cinema, going to the park/town etc. but she prefers to go shopping with me.
We try and have a family day out once a week, where we go to the beach/zoo/local attraction/visiting friends or family for the day, and DH tries to take time off work to come with us - it's worked out so far!
I think once they get to senior school, it's ok to let them make their own entertainment in the summer holidays, as long as they will join in with family activities when you ask them too. I really don't worry about screen time at the moment - it's only for a few more weeks!