This is a blog informing you of a minecraft scam that's going around...
The Optifine.me free cape scam is where they make a copy of the optifine site and make it look official.
They say that they will be offering a free cape if you put in your username and password to your account.
This is to get your account and screw up your life.
They usually use your account to scam others by advertising and getting the person banned on major servers like Mineplex.

So I'm warning you....
If you see your in game friend talking about getting a free optifine cape.
They are most likely some dude that just took your friend's account through the scam.

BEWARE! BE SAFE! 

(Players that have been scammed and are being used as bots.)