@应届毕业生们，这份社保指南请及时查收！

Group 1 - The article emphasizes that social insurance contributions are mandatory during the probation period, and employers must pay social insurance for new employees based on their salary in the first month [3] - It clarifies that the monthly contribution base for new employees should be their salary for the month they start, rather than the minimum base [3] - The article states that employers cannot substitute social insurance payments with cash allowances or other forms of compensation, as this is not legally recognized [3] Group 2 - Social insurance fees consist of contributions from both the employer and the employee, with both parties sharing the responsibility [3]