Somebody asked me today what and how to use hashtag.

According to Wiki: A hashtag is a type of metadata tag used on social network and microblogging services, allowing users to apply dynamic, user-generated tagging that makes it possible for others to easily find messages with a specific theme or content; it allows easy, informal markup of folk taxonomy without need of any formal taxonomy or markup language.

... What is that mean?

Consider it as a type of keyword that you want to associayte with your social media and blog post. #UchikuraCo is a hashtag. By having this hastag, you can search Internet using this hashtag.