Maybe it's just the people I have added on LinkedIn but it always strikes me as a very superficial place and not the one for deeper connections or discussions about projects. Twitter on the other side seems to be more promising (at least in my case).
While my posting cadence of "something interesting" every few months works well for Reddit, that's not something that gets people to follow and engage with you on Twitter.
In my case, doing nonprofit/volunteer work has been a great place to make new friends (and the occasional enemy).
Sadly not interested in nonprofit volunteering at the moment, too worried just making ends meet. London’s very expensive these days and wages aren't great.
After you built up a few interesting accounts finding more accounts via Twitter is easier and less noisy.