Just join it as long as the airdrop not require you a personal data, usually they just ask you to following twitter or like a facebook page just do it, if the token worth something youll make some profit to your self. if not just unfollow and unlike the page. I have like a dozen token with no price and no devlopment after distribute. But still i join some airdrop, whi know in the future ill get some good airdrop token like blue token which i miss.