What’s a tagline? Think Nike. Just Do It. That’s a tag line for a brand.
When I first started this blog I had several tag lines that slowly changed over the years. My first, when my blog was called Bitchfest, was “Bitchfest, the only place to bitch about celebrities, lifestyles and everyday pains in the arse!” So appropriate I thought, since that was the plan. It became more elaborate after that until I read the book Fame 101 and there was section on creating a tag line.
A lot of authors use their genre to add to their tag line. But if you have no idea what genres you will keep writing in, young adult fantasy for example, then I don’t suggest using a tagline about what you write. As far as I’m concerned I agree with Jay and Maggie, it should tell people what you are and what you do, not what genre you write in. They will find that out soon enough. And what happens if you change genres or do something else that you will need to add to the tag line? Make it simple and about you, not what you write. That way, you won’t have to keep changing it all the time.