My daughters don't go to a lot of sleepovers. The only places they have stayed at are where we really know the family well. Mostly their friends stay here. The girls are so busy with their activities we don't have a lot of time for sleepovers.
Another thing I wanted to add, they do have their own laptops they received for Christmas. They do not have any social media accounts and mostly use them for school stuff. They do have email but I can check it whenever and I check their laptops whenever. If they happen to go on a site that is not approved the laptop is taken away.
We have talked about high school for a cell phone. We have gone back and forth on it but like I said earlier, there hasn't been a real need for it as of yet. They know my number and my hubby's number and I am still with them for the majority of their activities. If I am not I do know they are somewhere with a phone or with someone who has one they can use if they need me.