LinkedIn is definitely an important platform for job seekers, as well as for companies looking to fill positions. However, it's important to note that the success of a job search on LinkedIn depends on various factors.

In terms of the percentage contribution of recruitment happening through LinkedIn, it's difficult to give a specific number as it can vary greatly by industry, company size, and location. Some studies have shown that LinkedIn has become a top source for recruitment, with a majority of companies using the platform for recruiting purposes. However, it's important to note that LinkedIn is not the only source of recruitment and companies often use multiple channels to find candidates.

As for the success rate of applicants applying to posted jobs on LinkedIn, this can also vary depending on the industry and specific job. It's important to have a strong profile and a well-crafted resume to increase the chances of being selected for an interview. However, the success rate also depends on the competition for the job and the qualifications of other applicants.

Overall, while LinkedIn is an important platform for job search, it's important to keep in mind that success on the platform depends on various factors. Building a strong profile, networking, and actively applying to job postings can increase the chances of success. It's also important to use multiple channels for job searches and not rely solely on LinkedIn.