What kinds of online social networking services (SNSs) are you using? Facebook, ResearchGate, Instagram, Twitter, or TikTok? These days, many researchers use SNSs to communicate with academic and non-academic people. If we use them well, they are useful and fun, and sometimes lead us to unexpected collaborations. However, we need to be aware of their pros and cons to use them wisely. In this seminar, We will talk about tips on the use of SNSs (mainly Twitter) as researchers.