can i add my all friends through chrome extension

  yes you can add all.

1.   open chrome browser if no please install

2.   go on given link

3.   click on ADD TO CHROME 

4.  wait just 5 seconds & then it will appear & then you have to click on add extension 

5.  go in group home page & click on given icon in pic

adding will be started, but here adding limit is only 500 at once. add 500 & wait a minute then add 500 & wait. like this you can add your all friends in group.

if any problem appearing comment down.