I was sent a file by a coworker via "sendshare" - my first time using the service. The page loaded a bit slowly and the ads came in before the actual download link. I was in a hurry to get the file - it was a time-sensitive job - and I ended up clicking on the deceptively-designed ad at the top of the page instead of the download button. It took me to a page that looked just like the download page but with no logo and the same fake "download now!" link at the top. My hackles went up and I closed the tab before clicking again.
I'd like to include it here so people can look at it and maybe tell me what I need to look for on my system (I'm running Security Essentials as we speak; AVG just finished; MalwareBytes is next on deck) or online to reduce my exposure, but it's so big I don't want to overwhelm people or Stackoverflow's system. I was logged into Gmail at the time, not Facebook, so I don't know if I need to change any passwords (I already use two-step verification on Gmail) or not.