Those aren't rumors but facts from what I have read. Hooters girls job is to to be friendly and talk to customers and sometimes you have to go to different tables and sign customers' napkins. This is not just from rumors but from reading blogs from girls who have worked there and also from reading Hooters reviews on Yelp etc.
I read that some girls can be catty and it's like high school over and over again... and sometimes men can be crass etc
Many people who used to waitress at Hooters have stated that being a Hooters girl doesn't involve sidework. I also read the same thing on Yahoo Answers from girls who used to work there.
I don't mean to be dismissive about this, but anyone can write anything on the internet as you know. Who even knows if they were really on staff there? I still think you'd be best off talking to real people who are working at the restaurant location where you intend to apply.