To answer your question Paajcha. . .
It sounds like you already understand that not everyone on LinkedIn is looking for a job!I halfway sort of am, (although at the moment I think I am hidden). Some people just want to be able to connect with other professionals. I like to join the groups, where it is easy to pose questions to peers. I've seen people do this when they get stuck on Excel, for example. Some of the people are recruiters, looking to be found by jobseekers.
But, for those who are looking for work, I agree, there are different approaches. I think people tend to let a little more of their personality show on LinkedIn, as compared to a resume. And, that is okay! You can really do it however you want. However, one word of caution. Do not say anything that would possibly close off an opportunity. For example, if you are exploring different types of work, you can't keep changing your LinkedIn profile to keep up with your job search. So, you need to be more general on LinkedIn. Otherwise, you run the risk of having a LinkedIn profile that does not agree with the resume, and you can lose the job. I had a client whose resume said he was looking for a specific type of work. He received a job offer. But, before he started work, the company looked at his LinkedIn profile, which said something totally different than his resume. They rescinded the job offer.
Don't let that discourage you, as, the lack of a LinkedIn profile can also hurt you!
Explore, create, learn! And have fun doing it!