To keep your idea simple you should PUT IT IN A NUTSHELL. = You should summarize an idea, a thought, or a story simply. Example: Twitter, write down your ideas/thoughts in 140 or less characters.
Could you care to explain what you mean? I want us to be ON THE SAME WAVELENGTH. = communicate with each other so that you understand each other. On the internet users mostly add emoticons after statements to let people interpreted their statements correctly.
You should BITE YOUR TONGUE to avoid a fight. = you should avoid saying things that are better left unsaid. In social media some people should think before they post.
I am sure it will BLOW OVER. = It will calm down, like a trend on any social media that will eventually die down.
I'll KEEP YOU POSTED! = Keep a person updated about a certain situation. Which today is very easy with the use of social media.
Some people are not creative at all, they are just a COPYCAT. = Copying the work of someone else. Some people just copy other people's status, pictures, and many more, and use it as their own.
Social media will become exstinct, WHEN PIGS FLY. = Something that will never ever happen.
Did you see that gangname style video? Yes, it SPREAD LIKE WILDFIRE on the internet. = news, information or random stuff being spread over the internet very quickly and to many people.
It takes a while to FIND YOUR FEET when you first start using Google+, but after a while you'll get used to it. = adjust to a new place or a new situation, become more comfortable in whatever you are doing.
Stop posting all that MUMBO JUMBO on your Facebook, it's really annoying. = Stop posting all that nonsense or meaningless speech.