Why is the job posting date of the recruitment website always updated?

This is mainly reflected in the following two aspects:

1. Publishing platforms encourage people, such as Zhilian and 51, to show that their websites have a larger job supply than their competitors, so they repeatedly provide job updates. Every day, there are thousands of jobs posted on the same day, but you find a job posted on the same day today and the same job the next day, and all the information has not changed, only the release date is updated to the same day. To put it bluntly, let users feel that my goods are full of goods, so let me pick them, which is full of popularity. Moreover, the stay time and the number of pages visited by each user on the website have increased several times, which is actually an act of deceiving users;

2. The employer's trick is that every position is published and the publishing platform has a valid period for filling in. Most companies clearly have their own recruitment cycle of two months, but they fill in the valid period as one year or even two years. On the one hand, personnel can receive more resumes, and the company's talent pool is rich in data, which is also an evaluation indicator of his or her work performance. On the other hand, each unit has its own account and corresponding channels on the recruitment website, which are composed of several positions. Personnel in the company are usually too lazy to update or delete the positions they have recruited. Only when new positions are recruited will they be added. If the positions they have recruited need to be expanded or re-recruited, they will be very convenient and need not re-enter.