The aim of this paper is to offer a first approach to the use by researchers of content curation in their publications on social networks, specifically in Twitter threads. An exploratory qualitative study has been carried out to present a taxonomy for the analysis of content curation in science outreach Twitter threads published by researchers. The proposed taxonomy is based on the parameters, grouped under the dimensions of Content and Curation, of: Content quantity, Content temporal range, Content provenance, Curation techniques and Curation integration. The results show the feasibility of this scheme by means of cases extracted from publications in Twitter threads of researchers belonging to various disciplines and with gender representativeness. It is considered that this taxonomy can be useful, not only for scholars and practitioners of content curation, but also, and especially, for the scientific community of researchers and disseminators when they publish on social networks.