bogus vacancies on internet

hi Planners

after receving response from some jobseekrs, i was just wondering what proportion of vancancies uplaoded on internet daily are bogus.

i am talking about all recruitment agencies who upload planning vacancies and also the employers themselves?

or there isnt a single bogus job up on internet?

i heared that companies does that i-e (advertise bogus vacancies) to influence their share price? this is in relation to employers themselves.

up to whay extent my perception is true?

can anybody put some light on that or share their experience? i dont know myslef as i havnt been applying for jobs myslef.

thanks