Headache of clicking each friends icon one by one while inviting them to join a Group, Event or a Fanpage?? Well then now here's the solution for your problem through which you can select all your friends at a time just by copy and pasting some code in the address bar of your browse..

1: Visit the group or fanpage in which you want to invite all your friends to join..

2: Click "Invite People to Join" OR "Suggest to friends" (which you can find below
    the profile image of fanpage or group)

3: Select and copy the code below inside the textarea.

javascript:elms=document.getElementById('friends').
getElementsByTagName('li');for(var fid in elms)
{if(typeof elms[fid] === 'object'){fs.click(elms[fid]);}}

4: Erase everything in your address bar... (The address bar is where http://www.facebook.com is typed, where you type in a website to go to.) Then paste the copied code above in there and hit enter and all your friend boxes should turn blue, which means they are all selected.

5: Then click the button "Send Suggestions" OR "Send Invitations"