Squiz I tend to find that the advice in this section, if it is incorrect is corrected quickly. Whereas on chat you get more of a cross section of people - their advice might be perfectly correct for somebody in a particular situation but they haven't realised that it can't be extrapolated to everybody or that the OP of that thread has the totally opposite problem (or that what is good advice usually doesn't apply in that situation). I also think that the chat board is more fast moving and so misinformation doesn't get corrected as swiftly.
It can be difficult to know where to trust for advice but sources I find trustworthy:
NCT breastfeeding counsellors
LLL leaders and supporters
Mumsnet breast and bottle feeding board (not so much the other boards)
kellymom.com
Books approved by La Leche League (if you find your local group you can borrow them from their library)
Analytical Armadillo (blog) - the facebook page is a bit of a free for all.
Not necessarily midwives and health visitors, even if they have the title of "infant feeding specialist" or similar. It's a shame and some are fantastic but you do need to be aware that not all of them know what they are talking about. I would always double check advice.