For Twitter valuation, the investment banking team estimated the multiples for three comps, Facebook, LinkedIn, and Yelp, based on the comps' projected 2014 revenue and projected 2014 EBITDA and the market price prior to the Twitter IPO.  

Describe how you would proceed to estimate the EV/EBITDA multiples for the comps:

- Where to find and retrieve the data

- Which equation to use

- What the inputs are

- How to estimate