A lot of the Facebook deletion advice comes down to: "I'm hypercompetent at managing my social life and am constantly invited to important events by direct contact, and barely remember what it would not be like to be that way, therefore I don't see a significant downside to immediate cessation of all FB use."
I don't advocate Facebook deletion (or the opposite: people can do whatever they want as far as I'm concerned), I just constantly forget to use it. So your comment doesn't ring true to me: I'm not anywhere near socially "hyper competent", my life just isn't organized around being invited to "important events". I just go to work, go home, and ping my friends from time to time or respond to their pings if I want to hang out. It isn't clear to me where Facebook would be a critical tool in any of this.
Well I think the fact of the matter is if you want to get rid of Facebook and / or social media while maintaining a social like you MUST become hyper competent at managing your social life.
I moved across the country and had to rebuild my social network from scratch without social media, you can do this through sites like meetup or checking local event calender's.
Once you meet some folks who you want to know better you can exchange numbers and quickly set up a coffee, tea, lunch, dinner thing and then get into the habit on checking up with them to see what they are doing. Once I established this relationship with people they began to invite me to things every once in a while, do this with 3-5 well connected friends and you should have options every weekend.
People are outsourcing the management of their social life through Facebook, if you want to stop using Facebook you really need to take back control of managing your social network.