Social Media is not a fad and will be the way people get messages across now, and even more so in the future.
The question is it right for everyone and every Bar. Maintaining a page is much more time consuming than one might think. If a page is not updated regularly it can harm your business more than help.
The questions you should ask yourself if you intend on opening up a Facebook or Twitter page is Why? Who? and how?
Why: Why are you starting a page. Your answer should not be because everyone else is doing it. You should take your time and figure out why you actually want a page and why will your page and business is different than all the others that are out there.
Who: Who will your page target. Is it existing clients, potential new clients. Your local neighborhood, the city at large. This will give you an idea of the type of content you should be posting on a weekly, daily basis.
How: How will you reach your taget market? Is it with promotions, weekly specials, open mic night, live bands. Its important that your page lets people inside your business and is the place where one will go to get information on what is happing there at any given time.
In the end jumping into social media is something one should embrace and treat as a new way to reach a larger scale of people for free or for minimal costs. Although do not just jump in blindly. Get yourself a plan and go from there I know you may just want to rush into it, but take your time try different things till you get it right. Once you do, and if you have a unique strategy you will be shocked at how people will respond.