We now have simple chat apps capable of doing almost anything LinkedIn does while using under 100 MB of RAM.
I’m guessing you mean “does” in the sense of a user-facing feature.
I’ve heard that LinkedIn searches for several hundred known browser plugins to identify potential abusive users. If the “simple chat apps” aren’t doing that, then it’s apples-to-oranges.
A probe collecting data in space takes <70 kB of memory. I fail to see how this statement should make me feel happy