I think trends are circular consumer patterns that are inevitable. Many of the brands we discuss are already known and the collections have been available for a while.
for exmaple Tiffany threads are all over the place during Christmas and holiday times, ever notice that?
I don't know if people necessarily catch on to a trend and follow or perhaps they already showed interest and researched it online and stumbled across TPF? I have seen this happen to myself a few times when I have googled a certain designer or item. my specific time was when I was interested in the Pomellato Veleno ring, the pomellato thread was inactive for a while and buried pages back- but once it was brought to the top of the page people started discussing pomellato and posting pictures of new Nudo rings etc...
TPF has never tempted me with bags- I find these are something I need to try on in person feel the weight, check out the pockets etc...but jewellery I have been tempted!
I think the one and only piece I can blame on TPF is my yellow diamond ring! when I saw Khol mascaras ring I knew I had to have a yellow diamond

before seeing her ring I thought it would be unattainable or coloured diamonds were just not for me, I can easily replace the temptation with gemstones...but no! the yellow diamond trend was definitely like wildfire here on TPF!!
regarding marketing reps for various designers or companies- yes they are definitely here- and probably gather information, but I don't think they post about their brands. I work for a Swiss watch company (small one but known within the watch community) and I have never posted the brand I work for or posted a picture of my watch in any of the watch threads, work is work and I like being part of this community "socially" if you know what I mean:giggles: