What are the hashtags for? Is that Twitter stuff? The idea is cool, and it's awesome that you're doing something. I do think it would be cooler if you posted your website address. A lot of people don't use Twitter, and it's run by a harmful mega billionaire.
Hashtags work on a wide range of platforms and double as search terms. It probably sticks in the mind of the average passerby better than website and gets people to your message about as well overall.