Now that Glassdoor.com is part of Indeed.com they require you to log into their site just to look at open jobs. They now want and e-mail address and phone number for the sake of "user security". If I am not going to apply for a job and am just randomly looking at the available jobs then my "security" isn't in jeopardy.
I could understand needing this information if I was applying for a job or post a resume through their site. I even reached out to Indeed about this and explained what I have expressed in this review. They absolutely did not care in the least what I had to say.
To me this is just data gathering scam so they can sell our user information without our prior consent to third parties and job headhunter organizations.
Recommendation: Try and find another job search engine and protect your personal data.