There aren’t many sites talking about all things Ad Tech/MarTech.
If you search for news, the top sites are The Ad Tech Daily and MarTech Today. Both are great sources, but people are not sharing their content that much.
If you search for the most retweeted news, you will find domains such as neilpatel.com, chiefmartec.com, and eff.org (about digital privacy.)
You can use this script to pull the most retweeted news, and this script to extract the domains from each tweet. Make your own conclusions!