1. From a marketing manager:

https://www.scribd.com/document/983199401/How-to-Spot-PBN-Footprints-and-Time-Your-Updates-to-Avoid-Ranking-Disasters-132079

1. From a marketing manager: Look, I've been running email campaigns for 3 years, and the ROI really surprised me—last quarter, we hit a 25% open rate with just a $500 budget