Titsntats
I once had a post go viral and was offered money for it. Just thought that I'd share my experiences:
I was approached by several 'journalists/media companies'. Many of them consisted on freelancers who actually make their money selling scripts/quotes and photos to other newspapers/magazines. They act like brokers and then auction the quotes/photo package online to media outlets (some want exclusivity/others don't). They were primarily interested in lots of photos (very similar ones depicting the same event so that they could put together exclusive bundles). In my case I had to provide around 20 photos and had about a two hour telephone interview. My story was featured in The Daily Mail, some women's magazines and The Sun. Only the best/classiest for me 
(and I didn't even have to sleep with David Mellor!).
I received around £300 (so not a huge amount). You may well get offered more, but generally we're talking hundreds rather than thousands here!
My motivation wasn't financial. It was to raise awareness about Sepsis (my husband had been misdiagnosed and ended up with organ/heart/lung failure in a coma on life support for weeks and then had to relearn how to sit up, swallow, walk etc. We had a baby and young child at the time). We donated all profits to The Sepsis Trust.
We recently were featured on a TV show on BBC1. We were not paid for this, yet filming took an entire day. It was filmed in my house and garden, so I also had to madly clean and tidy, knowing that I was inviting millions into my home.
Unbeknown to me, however, they hired a stunt body double to play the part of me (you know that you've truly made it big when someone is paid to play the part of you! 😉). Unfortunately she had an even bigger arse than me and appalling taste in pyjamas (bright pink with elephants on!). At one point my husband and I were depicted as living in a 1970s house, with the worst imaginable decor wearing matching tartan pyjamas and cordoroy dressing downs! The cameraman took an unhealthy interest in my 'stunt arse' with lots of close up shots (pred text just changed that to shits!!). Had I known what lay in store for me, I would have insisted that Pippa Middleton play the role of me whilst wearing pyjamas from The White Company!
Anyway, my point is that, the media will always seek to dramatise events and put their own creative slant on things. They didn't make anything up though, insofar as, all quotes/photos were provided by us. In your case they will almost certainly want lots of photos of you and your friend, you and your fiance and you wearing your dress (or at least posing with a similar one). You need to consider whether you would be happy to do that for the money involved. I personally wasn't keen on having photos of my family and I splashed all over the papers and TV (I hate seeing photos etc of myself), but was persuaded to do it to raise awareness.
Anyway, I hope that helps tell you what to expect.