Can we use "what the heck" in formal contexts to denote a more friendly environment?

I see in many movies bad words are censored or simply replaced by a beep sound. But the expression what the heck is not censored and you can hear it clearly.

You can also see that this expression is used in many conversations on online forums and Q&A websites. It seems to me that this expression is used widely enough to not to be considered that bad anymore.

Am I right?

Also I see a new trend in small free service-based websites which tend to use more vernacular language like:

Guys, don't let us think of what you want to send. Just do it right, right?

and this expression seems to be used more and more. My question is, am I right about what I think of it? Can I use this expression to denote a more user-friendly website?

Update: The main question here is, can I use this expression in a website, magazine, newspaper, or any indirect written media without offending readers or users?

Solution 1:

It's unprofessional. There are quite a few websites which use this more casual, personal tone and sometimes it is much appreciated by the viewers. In other situations it could be viewed as immature and inappropriate. Know your audience and the tone you wish to present.