With just Joomla, the sign up process I can enable captcha, but not Jomsocial. I have paid for an Aksimet subscription in desperation as the team recommends, however this has not curbed the sign up spam issue.
Until we can have a simple captcha work on sign up, I am putting this on ice.
JoMSocial have built in Captcha since it's early versions, and you should be able to enable it any time in JomSocial registration flow.
Also, it's important to know how JomSocial is not a user manager. All users at your Joomla site are handled strictly by Joomla itself. JomSocial only extend it with it's profile features.
That being said, if you have any other component that allow creation of new users, it could easily be "exploited" for spam purpose.
And another thing to consider, even without ReCaptcha (which is as stated earlier disabled by default but can be enabled) JomSocial already have the built in system against spammers, and thats simply a custom profile fields.
Joomla as well as VTiger 6 are free open source software, while Joomtiger is paid for and supports up to VTiger 5.4, it only supports VTiger 6 paid (On Demand), in all fairness the free VTiger 6 version has only been out since January 2014, however attempts to get a handle on a timeline or roadmap for being VT6 free compatible is met with poor communication.
I had noticed that the meta tags for the images were not showing, so I dropped the team a line to ask if they could consider it and within hours they had done it and emailed me the update, awesome!
The offer for help was that I give full access to my system, which is a security issue for me, and I think the issue may be SSL related, but I am not sure.
It is a pity to hear you did not get it work. There are instructions, faqs and contacts possibilities on our site and instruction videos on You Tube. This component is a STAND ALONE extension (no need of any other software), which can be used if you put in the right settings. These settings are a "Vtiger Portal Server Path", "Character Set" and if you like to see the portal without registering in Joomla or not. We are at all time available to help our customers, and sometimes we need to see things in the working settings, and therefor we ask credentials to see what is happening and to correct wrong settings inside the options/settings. If your vtiger installation works and the portal from vtiger is working then most likely our component will also. Hope to hear from you so we can help to solve this problem.