Hi lakoer ,
Thanks for the feature request! Also it's great to see you're still using Buttonizer after the beta of 2.1, we're glad you like it 😎
Good one! Currently Buttonizer uses FontAwesome version 5.7, but we should defenitly update to FontAwesome version 5.14.0 (the newest version). That version does have the TikTok icon available.
Currently we're working on a big update for next month, so we'll make sure to update FontAwesome in that release!
I'll update this topic as soon we've updated FontAwesome 🙂