Apparently, YouTube doesn't let people post videos on their Blogger sites directly from YouTube. Particularly, mine.
Anyway, here's a compilation of LOST's Smoke Monster's appearances from Seasons 1 to 3. Unfortunately, it doesn't include Cerberus's appearance in "Left Behind" - which appeared after "Exposé."
Here's the link:
I'll embed the video too. - in case it works.
Here's also Cerberus in "Left Behind."
This one is when it appeared to take pictures of Juliet while Juliet and Kate were hiding from Cerberus.
This one is when it chased Juliet and Kate and got thwarted by the sonic fence.