Early career investigators (ECIs) in the Social Sciences and Humanities need to receive adequate information so that they will be empowered to progress in their academic career and deal with the various evaluation processes that constitute an essential part of their professional development. This article relies on an informational-ecosystemic approach originally developed in the context of resilience studies and crisis communication and uses it as a theoretical framework to analyse and understand the "early academic career building information ecosystems" (EACBIEs), into which ECIs professionally develop. The characteristics of these ecosystems are then refined through the analysis of interviews conducted with ECIs from all around Europe in the framework of the European Network for Research Evaluation in Social Sciences and Humanities (ENRESSH), European Cooperation in Science and Technology (COST) Action. The analysis reveals the remarkable heterogeneity of the information ecosystems into which early career researchers have to build their career in Europe, articulating a diversity of formal, non-formal and informal learning environments, and several related information channels, as well as showing a geographical spread that covers institutional, national and international levels. Furthermore, although the diverse information channels at hand and geographical levels at which they operate appear in some cases to be complementary, and even mutually reinforcing, they can also, in other cases, be dysfunctional, fragmented and unfair to some extent.