According to the report of effective advertising analysis in the Taiwan area released by Rainmaker XKM International Corp., the advertising amount of care product industry is up to 28.8 million dollars, ranking second place in whole industry. In the market of care products, each firm is in high competition. For winning form the competition and accessing to consumer, the firms look for celebrities to be the endorsers for their own products, and even spend tons of money to make consumers know their products and brands in the short period. The strategies of endorser have many advantages, and be adopted widely. Besides, based on the properties that the care product industry is in high competition and the product life cycle is very short, whether the expenditure of spokesman can reach firm¡¦s expectation? Are the endorsers that firms choose are liked by public? This research takes Olay as example to discuss the effect of endorser credibility on advertising effectiveness. Also, this research takes involvement with advertisement as moderator variable to realize the relationship between endorser credibility and advertising effectiveness. Finally, comparing Olay¡¦s endorsers belong to different products to understand consumer¡¦s evaluation. The consequences of analysis indicate that the endorser credibility will affect advertising effectiveness and the trustworthiness, relevance, and likability has higher positive relationship. In addition to, the attractiveness and expertness has lower relationship. Besides, involvement with advertisement certainly has moderator effect between endorser credibility and advertising effectiveness. Finally, this research gives some practical advices for the business administrator according to the consequences of research.

Social media offers a myriad of opportunities for entrepreneurial marketing strategies that leverage the power of communities, especially when they are combined with traditional approaches such as celebrity endorsement. The reach, frequency, and speed of communication on social media offer the ideal leverage for the drivers of entrepreneurial marketing. However, the rapid rate of change may threaten the effects of investments in entrepreneurial marketing on social media and they might become only short-lived. Employing structural equation modeling, we test the long-term effect of Facebook-based celebrity endorsement on purchase intention among 234 members of a Facebook fan community in a two-wave longitudinal design. We argue that this relationship is mediated by a sponsor's brand image and moderated by brand differentiation. This study is the first to investigate the long-term effects of entrepreneurial marketing on social media. We present the contributions and implications of our findings as they affect research and practice.

Social media has become an attractive platform for companies to advertise their brands on and a common method is to pay internet celebrities to use their fame to promote the companies’ brands. One of these social media platforms is Youtube where “YouTubers” using their fame to promote brands on a daily basis in form of video logs (vlogs). Studies has indicated that the more credibility an endorser has, the more likely the purchase intention is, but also higher retention for the advertised brand. Therefor the purpose of this study is to describe the factors of endorser credibility, benefiting endorsers in how they can increase their credibility. The study also looked at the relation between endorsers’ credibility and attitude towards the advertisement, benefiting companies in choosing the most profitable endorser. A quantitative study was conducted to answer the research purpose, where a questionnaire was sent out to students on LUT (Luleå University of Technology). The results of this study suggested that endorsers credibility consists of all the five factors that was looked at in this study which was trustworthiness, attractiveness, expertise, homogeneous and tie strength. Findings of this study also suggested a direct and positive relation between some factors of endorser credibility with attitude towards advertisement

本研究主要目的為探討代言人與產品適配度不同時，其發生不同類型的道德問題，對購買意願之影響。當代言人與產品適配度不同，代言人與產品間之連結程度就會不同，因此，當代言人發生不同類型的道德問題時，就會對購買意願產生不同的影響。故本次研究採用兩個自變數：代言人與產品適配度(高/低)及道德問題類型(違情/違法)，來檢驗是否會影響消費者對產品之購買意願，並以受試者之主觀道德程度(高/低)以及客觀道德程度(高/低)作為調節變數，利用實驗設計的方法，進行一個2×2之組間實驗，並以虛擬的代言人作為實驗對象，取得有效樣本126份。本次研究利用獨立樣本t檢定、雙因子變異數分析以及三因子變異數分析檢驗所得之結果，並獲得以下之結論： 1.當代言人與產品適配度較高時，消費者購買意願會較高。 2.道德問題類型對購買意願有顯著影響，相較於代言人發生違情的道德問題，當代言人發生違法的道德問題時，消費者購買意願會較低。 3.代言人與產品適配度與道德問題類型無交互作用，不論代言人代言何種類型的產品，相較於代言人發生違情的道德問題，當代言人發生違法的道德問題會有較低的購買意願。 4.受試者的道德程度與道德問題類型無交互作用，不論受試者之道德程度高低，相較於代言人發生違情的道德問題，當代言人發生違法的道德問題，消費者會有較低的購買意願。 5.道德問題類型對代言人可信度有顯著影響，相較於代言人發生違情的道德問題，當代言人發生違法的道德問題時，代言人可信度較低。 6.不論代言人發生違情或違法的道德問題，受試者皆認為廠商需與代言人暫停合作關係，然又以發生違法的道德問題時，更應與代言人暫停合作。 / The purpose of this research is to understand the effects on purchase intention when product fit and moral issue of endorsers are in different level. When product fit is different, the connection between product and endorser will be in different degree. Therefore, endorser have different types of moral issues which will have impact on purchase intention. There are two independent variables: Product fit (High vs. Low), Moral issue (illegal vs. unfaithful) and two moderator variables (subjective moral level vs. objective moral level) and we conduct a 2x2 factorial research to test whether they will have influence on purchase intention. There are 126 effective questionnaires and the following is the results: 1.Different type of moral issues will affect purchase intention. When endorser has illegal moral issue, customers will have lower purchase intention. 2.There is no interaction effect between product fit and type of moral issue. No matter how product fit is, when endorser has illegal moral issue, customers will have lower purchase intention. 3.There is no interaction effect between moral level and type of moral issue. No matter how moral level is, when endorser has illegal moral issue, customers will have lower purchase intention. 4.Different type of moral issues will affect endorser credibility. When endorser has illegal moral issue, he or she will have lower credibility. 5.No matter what kinds of moral issues, customers think companies should stop cooperation with endorsers. When endorser has illegal moral issue, customers think companies should stop cooperation with endorsers much seriously.