After decades of being an ACM member, I cancelled my membership. CACM no longer reports on foundational computer machinery and software developments. It has become a promotional avenue for blockchain and AI/ML. Some editorials hold thinly veiled political views. It most certainly isn't the ACM that I joined decades ago.
Most of my keeping up with tech is via Hacker News. Obviously the quality of materials varies greatly, but for the most part I do find it useful. In many cases the comments lead to further interesting information.