From 1st uni, no. I didn't stay in touch with anyone.
From 2nd uni, I didn't house-share... but am in touch with quite a few of them. At a distance.
From 3rd uni, I didn't house-share either... and I thought I got along with people quite well in uni, but somehow it feels like most of us just aren't on the same wavelength anymore. It feels like lots of people were having some sorts of 'issues' in the first year of their jobs, and nobody had the time to just meet up or even talk about it. P!ssed me off. Most people seemed to mainly look for ways to 'brush their problems under the rug' and seek out people who would help them with this, instead of actually helping each other.