sobrenome

Oh, it's changed? I was going to try to keep an eye on WhatsApp Web. I tested when I last updated and share wasn't working on desktop...
A CSS file is supposed to be added. I'll test in RC4 (I'm assuming that's what you added it to?).
edit: WhatsApp Web sharing still isn't working for me. 

Make sure the file is here: /your-ips-root-folder/system/Content/ShareServices/Whatsappcvh.php. As long as the file is there it should show in your admin cp on the sharing page even if you haven't installed the .xml file. The .xml file is only for the template. If might be named something odd - Whatsappcvh - if you haven't installed the xml file.
Is it showing on topics in mobile/tablet? Or just not in the admin cp? The latest version hides the share link on frontend on desktop view because it doesn't do anything there.  Could put a toggle setting if this is your issue?

@sobrenome Sorry, forgot to tag you.

Very nice! It will be my first customization! 

​It's still in development, it's not quite ready yet

​It's part of my custom app right now but I'll look into making it into a separate plugin. So far I have WhatsApp, Tumblr, and Pinterest as extra share services.

I did.  I just added the template, the CSS, and then Whatsapp.php to to system\Content\ShareServices.

I tried and failed maybe someone with experience.
I had the button on my site but I cannot get the skin to display at the same time.

+1. Also need more share button. examle: flickr & instagram for Gallery

Where is IPS team? Please, add WhatsApp button to the built in options!! 

​This is great ! I also want to add a WhatsApp-Button to the Desktopstyles. Why? On Wordpress, many people see that button and visit the site using their mobile just to share content via WhatsApp, so Desktopusers should also know they have the possibility to do so 

Is @Mikey  still around? Let's get him to do it!  He made a hook for Tumblr!

+100

Please, add WhatsApp as a Sharing option in site Promotion.
I have just taken a look at my website statistics right now and more than 50% of the visitors are accessing it by cell phones.
It's a must for great community promotion the option to share content by WhatsApp.
AddThis (http://www.addthis.com/blog/2014/08/13/new-services-added-including-whatsapp-sharing/#.VNqycMbZGC8) and AddToAny (https://www.addtoany.com/services/whatsapp_button) already offer WhatsApp sharing button.
There is a ready to use javascript that can be used by IPS 4: http://whatsapp-sharing.com

I'm looking at creating my first hook it works on android in fact I don't have IOS like I said that was just a quick rough test to see if it worked.
I'm thinking about hook with a small floating button in the mobile skin to share the current page via whatsapp

Actually looking more into this I have just implemented it quickly to my site via mobile. Needs some work but I added
 
<div class="right"><a href="whatsapp://send?text=JustATest"><img src="//phoneunlockserver.com/images/whatsapp.png"/></a></div> 
To my mobile skin after 
{parse template="defaultHeader" group="global" params=""} </if>I think it's better than relying on external websites and javascript

Please, add WhatsApp as a Sharing option in site Promotion.
I have just taken a look at my website statistics right now and more than 50% of the visitors are accessing it by cell phones.
It's a must for great community promotion the option to share content by WhatsApp.
AddThis (http://www.addthis.com/blog/2014/08/13/new-services-added-including-whatsapp-sharing/#.VNqycMbZGC8) and AddToAny (https://www.addtoany.com/services/whatsapp_button) already offer WhatsApp sharing button.
There is a ready to use javascript that can be used by IPS 4: http://whatsapp-sharing.com

+1 For this

Sure why not

Please, add WhatsApp as a Sharing option in site Promotion.
I have just taken a look at my website statistics right now and more than 50% of the visitors are accessing it by cell phones.
It's a must for great community promotion the option to share content by WhatsApp.
AddThis (http://www.addthis.com/blog/2014/08/13/new-services-added-including-whatsapp-sharing/#.VNqycMbZGC8) and AddToAny (https://www.addtoany.com/services/whatsapp_button) already offer WhatsApp sharing button.
There is a ready to use javascript that can be used by IPS 4: http://whatsapp-sharing.com

Please, add WhatsApp as a Sharing option in site Promotion.
I have just taken a look at my website statistics right now and more than 50% of the visitors are accessing it by cell phones.
It's a must for great community promotion the option to share content by WhatsApp.
AddThis (http://www.addthis.com/blog/2014/08/13/new-services-added-including-whatsapp-sharing/#.VNqycMbZGC8) and AddToAny (https://www.addtoany.com/services/whatsapp_button) already offer WhatsApp sharing button.
There is a ready to use javascript that can be used by IPS 4: http://whatsapp-sharing.com

I played around and added it using this generator: http://whatsapp-sharing.com/
Easy as 1-2-3 

I looked at this, too. Seems not too hard to implement. On my favorite Wordpresssites, most shares are done via WhatsApp since they installed that plugin.

Im pretty sure, we will see this in IPS4 (Core or Plugin)

Please, add WhatsApp as a Sharing option in site Promotion.
I have just taken a look at my website statistics right now and more than 50% of the visitors are accessing it by cell phones.
It's a must for great community promotion the option to share content by WhatsApp.
AddThis (http://www.addthis.com/blog/2014/08/13/new-services-added-including-whatsapp-sharing/#.VNqycMbZGC8) and AddToAny (https://www.addtoany.com/services/whatsapp_button) already offer WhatsApp sharing button.
There is a ready to use javascript that can be used by IPS 4: http://whatsapp-sharing.com