Does these job listing websites like monster.com or careerbuilder.com actually help people getting jobs?

They can, but you have to first understand the recruiting system from a company's point of view.  Best candidates come from personal referrals from employees with good track records within a company (even if the candidate is external).  Then company recruiters look at whatever ends up in their "inbox" -- depending on how the company has solicited jobs, it can be emails with your resume in response to a job description, or it can be you applying to a job on the company's website.  From here, it gets murky (less clear).  If a recruiter isn't finding the right people applying, she may go to "the mass market" - Monster, CareerBuilder, Dice, GlassDoor, Indeed, Beyond, Simply Hired, ZipRecruiter, LinkedIn, etc.  Many companies pay to have access to these job sites where they can search for specific skills and pull up resumes of those who have uploaded them to those sites.I wouldn't say any of them are "fake data," but posting your resume to these websites means you're just one among millions of others looking for jobs, hoping to be found.  So make sure you take advantage of opportunities to enter skills and keywords, if allowed, because that's what a recruiter would be searching for.Note there are also 3rd party "recruiters" who represent no company that want to link you up with a company. 

http://www.monsterindia.com/ - Monster's Site. Or any other site for example. If you sign In and apply, 75% of the times you will not be getting a call directly from the company you will have applied. It will be a job consultancy firm.So, basically, the feed coming to the consultancy firm will be a little bit old. It might be a 2 weeks to a month old. So, after applying, the person will be having a 50-50 chance of  getting a interview. This is because the post applied for will mostly be  filled. Even if not filled, the quality of the job which are shown are not the most required for the company. After 1 -2 months of wait after applying in the career portals, your job will always depend on your luck because the interview is always in your hand.So, in a short note, NO- All these sites are not so worth it. It is much better getting through referrals, trying on your own.

Thanks for A2A.The job listing websites indicates that there are some vacancies in that particular company. Generally there are too many things that happen behind the scenes than actually seen. I am not certain about this practise in all the companies but I can vouch that this happens in most of the companies. Say a big MNC has a opening, then a consultancy speaks to MNC and says it will fill the post and starts headhunting. If a MNC does not have a dedicated HR Team for headhunting, it will take the services of a local firm which is good at headhunting. Generally Consultancy tries to bridge the gap between the supply and demand. I got an interview call from a company which was acquired by Google. I did the following. There was an opening in that company. It was a time i was actively looking for a change. In their website, there was a career section and I had applied there. I got a call from a consultancy stating that I had applied for that particular post and they scheduled an interview. I had applied on a job listing website and I did get several calls from a recruiter/consultancy regarding the opening and an interview was scheduled. What I have noticed is this, In Job listing websites, there are numerous fake listings of companies to gathers the Resumes of people in order to supply good people for a company. They try to be equipped with resumes so that as and when there is a need, they can service it. Most of the time, the companies need good candidates urgently especially in Service Companies. In product companies they actively look for people. In short, it is by luck that you get a call from these websites. There is a hack for this. Every 2 weeks once, you delete your resume and reupload the same. This keeps your resume fresh and you will be easily seen by most of the headhunters.Hope this helps.

Hi,I am not sure about http://careerbuilder.com but People gets calls or Mails related to job openings through http://Monster.comMay be they do not have client base as that of http://Naukri.com but People do get calls from Monster.

NO they don't. They are money spinners. It is you who need to be good for the position available and prove it in a slightly excited but mostly in a matter-of-fact way. Direct reference works the best.