Is LinkedIn turning into Facebook?

I think it is more likely turning to a spam feed ;(

Not entirely ...yet. But yeah, it becomes not so business related anymore.

Sometimes when I see FB meme's appearing on LinkedIn it really makes me wonder...

Not entirely, but posts have definitely drifted from business/industry related to life updates, anecdotes, memes, and casual facebook-like posts.

Some people share inappropriate things on LinkedIn.

First of all, let us analyze both sites, in terms of demographics. LinkedIn has mostly businesspeople on it, while Facebook has mostly teenagers and college students. Both these demographics have different needs and expectations.