This past Monday, CBS' hugely popular sitcom, "How I Met Your Mother" came to a conclusion. Within minutes, whether you were a fan of the show or not, if you were anywhere near social media, you knew the big "reveal".

Places like Facebook are great ways to connect with friends who share similar interests who may be too far away to see on a regular basis. But, when you post things publicly, it also exposes all of your friends to what you have to say.

What's appropriate for Facebook or not is a whole different conversation, but when it comes to movies and TV, are there any unspoken rules among your friends as to when it's fair to post something that gives away part of the show?

Especially with today's technology; with DVRs, online broadcasts, and TV show rentals, not everyone watches the same episodes at the same time.

I usually figure that for a big, highly anticipated episode, 24 hours is a fair amount of time to let everyone catch up.

But, that being said, many people also start their posts with the disclaimer, "SPOILER ALERT", so people who haven't watched yet can skip past the comment without ruining anything.

So when it comes to talking about spoilers on Facebook or other social media, what rules do you follow?