Many businesses are jumping on the Twitter bandwagon at the moment, whether it’s to promote new services or interact directly with their customers on a one-to-one basis.

However, the problem with many companies are the restrictions of firewalls to avoid heavy abuse of social network use by untrustworthy staff members.

I realised this morning you don’t need to visit twitter.com to manage the your Twitter account – there are plenty of other web-based Twitter applications setup which are unlikely to be listed in the firewall’s blacklist, essentially acting as a proxy to access Twitter’s services indirectly.

Here are a few to try out:

Br.st

Very well designed and simple to use interface with additional multimedia functionality.

Twithive

More focussed on lists and channels of activity streams.

Brizzly

The added benefit of connecting with Facebook as well

Seesmic

Web-based version of the popular Twitter desktop application

There are also a selection of web-based Twitter apps intended as mobile web apps but work perfectly well on the desktop, especially in a sidebar of your browser:

Dabr
Slandr
Hahlo

Try a few to see which one you prefer – each have their own perks.

On a sidenote, if you haven’t already, install a “decent” browser like Firefox, Google Chrome, Opera or Safari. All these browsers are far superior to the corporate preference of Internet Explorer and tend to cope better when it comes to web-based apps.

Many of these also have the ability to enhance the browser with extensions and addons to interact with social networks (although you may still encounter firewall issues with these). You may also find that most company policies don’t allow you to install software but it wouldn’t hurt to ask your friendly IT department for some assistance.