Social media have grown into a powerful marketing communications tool in the global market. A number of companies are dedicating their time and resources for building trust and rapport with consumers through various social media platforms, but there is a dearth of research on their use of Twitter. The current study, therefore, examines global brands with a Twitter account and their tweets targeted at consumers. The results indicate that marketers attempt to attribute human characteristics to their brands using human representatives, personal pronouns, verbs in the imperative form. Also, satisfaction and investment were the most frequently found consumer-brand relationship determinants in the global brands’ tweets. This study offers the perspective that Twitter serves not only as an optimal vehicle for disseminating corporate information but also as a means to develop and cultivate consumer-brand relationships. Limitations and future research are discussed. / text

Cette thèse étudie la perception de la marque vieille par les consommateurs selon une perspective anthropomorphique de la marque (perception et stéréotypes des personnes âgées). La marque perçue vieille est appréhendée en fonction des caractéristiques qui lui sont associées. Elle est multidimensionnelle et ambivalente (positive ou négative). Cinq études sont menées dans cette recherche. Une étude qualitative exploratoire (étude 1), nous conceptualisons et définissons la marque perçue vieillie, identifions ses dimensions, ses conséquences et ses modérateurs. Trois études quantitatives (études 2, 3 et 4), nous construisons un outil de mesure composé de quatre dimensions : expertise, déclin, intemporalité et entretien. Une étude quantitative (étude 5), nous testons un modèle intégrateur et les hypothèses de la recherche. Les dimensions de la marque perçue vieille ont des effets significatifs sur la nostalgie du consommateur, l’attachement à la marque et la confiance dans la marque. Ces relations sont modérées par l’orientation temporelle vers le passé et l’âge du consommateur, ainsi que le type de vieillissement de la marque (positif versus négatif) / This doctoral dissertation examines the perception of the old brand by consumers from an anthropomorphic perspective of the brand (perception and stereotypes of the elderly). The brand perceived as old is apprehended according to the characteristics associated with it. It is multidimensional and ambivalent (positive or negative). Five studies are conducted in this research. In study 1 which is an exploratory qualitative study (study 1), we conceptualized and defined brand perceived oldness, identified its dimensions, its consequences and moderators. Following that, three quantitative studies (studies 2, 3 and 4) were carried out in which we built a measurement scale consisting of four dimensions: expertise, decline, timelessness and maintenance. Finally, a quantitative study (study 5) was executed to test an integrative model and research hypothesis. The brand perceived oldness dimensions have significant effects on consumer’s nostalgia, brand attachment, and brand trust. These relationships are moderated by consumer’ temporal orientation towards the past and age, and by the type of brand oldness (positive versus negative)