I heartily recommend everyone with a Google account follow that link and double-check your security and allowed app settings. (Also take some time to go through your app-specific passwords and revoke any that aren't relevant anymore.)
In addition to being good practice in and of itself, Google is currently doing a promotion where they'll increase your Google Drive space by 2 GB if you go through their security checklist (see link below):
But if you refuse to give them your phone no. - for much the same reasons you should be hesitant about giving LinkedIn your email address - then it is impossible to complete the check. No 2GB for me, then!
In addition to being good practice in and of itself, Google is currently doing a promotion where they'll increase your Google Drive space by 2 GB if you go through their security checklist (see link below):
http://googledrive.blogspot.com/2015/02/safer-internet-day-2...