Girls, Can I call a girl "sweetie"?

There's this girl that I'm talking to online and she's really nice to me and I think she's sweet. I don't know if I will try to pursue her or anything, but basically I want her to know that I really like her, so I was thinking about addressing her as "sweetie" the next time I exchange messages with her. Is this a bad idea? Is this weird or would she be turned off?

I was thinking something like:
"Sweetie, check this website out!" or "Thank you, sweetie, I appreciate it!"
Girls, Can I call a girl "sweetie"?
Post Opinion