How to express interest online without being creepy

I recently moved to a new location and surprisingly a girl who I thought was pretty since high school lives close to me. We went to different schools so there's not too many common circles but after seeing her instagram through a mutual acquaintance that I don't really know either, I followed her and she surprisingly followed me back. Now I don't know if she's taken or not, but is there a way for me to express interest in her without seeming too down bad? I'm ok being rejected but I don't want to seem creepy.

I'm a horrible texter but how does something like: Would like to get you know better sound?