I'd not rely on local Facebook pages unless a lot of different people were recommending the same person. Far too many "friends", "family", "spouses" recommending their husbands/brothers/fathers/sons etc so very biased.
Best way, we've found, was to ask a tradesman when you find a good one, i.e. one that turns up on time, one who's tidy, one who does a good job, etc - they'll usually only recommend people like themselves, and certainly not the "bodgers" who they'll know by suffering having to work with them on other jobs!
We got a really good "team" based on a "random" plasterer who we got to do a small job - we were really impressed with him, and asked him if he knew a good joiner to put in a door architrave and skirting boards after plastering - he gave us a name and phone number of a joiner he'd worked with - we got in touch, he came, did the work, and did a brilliant job of it. We then gave both the joiner and plasterer some more work in a different room, which also needed some new electrical sockets and extra lighting fitted - we asked them both (separate days) and they both gave the same name and number of an electrician - again, we got in touch, he came and did the work, and again, brilliant job, so whilst he was here, because "word of mouth" seemed to be working, we asked him if he knew a good plumber (as we knew we needed some plumbing work in a few months time) - he gave us a name and number, who we used a few months later, part of the plumbing job needed some remediation of a plasterer as part of the job and he brought in the original plasterer! Turns out they all knew each other and regularly used each other. A couple of years later, we phoned the joiner asking if he did replacement PVC windows, he didn't, but he gave us name and number of a window fitter, who again, was brilliant and it turned out, he was part of the same loose "team". That lasted several years, but unfortunately, one by one they retired, but at the same time, we'd done our house and didn't need much doing, so by the time we wanted to do more work again, they'd all gone and we had to start from scratch!