Invite Friends.

[som]

I would like to draw the kind attention of the site Admin regarding the subject matter. It would be nice to have an option for sending invitation to the contacts of the users Email id to join this wonderful site. As I have seen that option in many sites, I hope it may also be possible here. Thanks in advance.

[nemo]

Thank you for your suggestion. I really missed this option. And finding a good one. (presently 'Tell a Friend' is available but finding a simpler solution). I shall enable this option as soon as I find.
At present only social media icon (e.g. facebook, twitter and google plus) is integrated with topics. However, google +1 is made off temporarily.