Although, in terms of numbers, according to that Wikipedia: “Several permutations of social behavior exist amongst the 23 species of spider considered to be quasi-social out of some 45,000 known species of spider”
Not sure if you'd count it as social, but the dancing spiders certainly put effort into courtship: https://www.youtube.com/watch?v=5qkzwG2lLPcPeacock spiders, dance for your life! - BBC
I've seen old brick wall with a lot of funnel of spiders. (I'm not sure it's the exact same specie of spider.) They were close, but not in contact of each other IIRC. I guess when there is not enough room they get use to have neighbors and then evolution makes them less grumpy.