We first wrote about the company’s Social Call tool earlier this month when its HTML-driven Craigslist application — now rebranded as Private Call — came out. The Facebook utility offers the same service, just specifically catered to Facebook profiles.

Basically, Social Call gives you anonymous VOIP capabilities. You give the company your phone number and put the app on your page. It then lets anyone click to call you, without ever having access to your number. The program also lets you set parameters for when you want to receive calls, so you could tell it to only patch people through between 9 a.m. and 5 p.m., for example.

The thing we initially liked about this application is its versatility. Certainly the Facebook platform adds a social element, but its HTML-based brother program could also have interesting uses for business purposes, or even for letting visitors to a blog/web site contact you only during specific times and without having to publicly post your phone number.

Arzoola’s CEO swears to us the service will remain free, though he says it will likely feature pre-call ads and optional “premium” extras in the future.

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Arzoola’s Social Call lets you make and receive free VOIP-powered calls through social network-specific apps. What sets it apart from other services is the fact that it lets you do so anonymously: Users give out their phone numbers only to Arzoola, which then masks them from public view.

“We simply act as an intermediary, shielding the phone numbers from each party,” CEO Roie Edery explained to The Inquisitr. “Instead of posting your phone number online, you substitute it with our ‘Call Me’ link.”

The first application, launched Saturday, is designed with Craigslist in mind. You just go to Arzoola’s web site, enter your phone number, zip code, and an expiration time (i.e. only accept calls for two days) — then it gives you code to post within your listing. The code lets anyone click to call you without ever gaining access to your phone number. While the tool is being marketed specifically for use on Craigslist, it could be used anywhere you can post HTML embed code — on a MySpace profile, for example, or on a blog where you wanted to receive calls for a limited period of time without divulging your digits.

Next up is an app for Facebook, which Edery tells us will be launching “very soon” — likely within the next week or two, pending the network’s approval. It will add a “Call Me” button directly below your profile picture and will let you specify what days and times to let calls be patched through.

All the applications use a business-grade VOIP carrier. As of now, the calls are totally ad-free. Edery says that could change in the future — but end users will always be able to use the service free-of-charge.

“Our focus is to provide this service for free,” he said. “Once adoption picks up, it is our intent to enable our audio advertising platform. Basically, while a user is on hold waiting for us to call the other party, they will hear an ad.”

Arzoola’s Social Call will also eventually offer premium services such as voicemail and number-free text messaging, Edery tells us.

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