What is the size of the Twitter profile photo?

This question looks deceivingly simple. Actually I had spent a better part of the hour trying to fit in the company logo to the space allocated for. There are two sizes to look out for in Twitter: the bigger profile photo, and the smaller icon displayed beside your Tweet (and this gets even smaller if viewed on small screens i.e. mobile phones). For convenience I Google for an answer and came up with 73x73px for the bigger profile photo. It seems, though, that this is no longer the case. The new size is 128x128px based on my measurement. I tried using 73px square for the logo and on the profile page, it looked small compared with the arrangement of the Twitter name and description beside it. The smaller icon is also something to look out for, as it resizes the photo into 48x48px (too small to recognize the details in the logo). I may be violating all sorts of marketing guidelines on how to display the logo for consistency purposes and so I chose to display a photo instead. And that is when I discovered the change in the Twitter profile photo size. So that's it. Try for 128x128 for the profile photo, and check how it looks like on the smaller version. It's a bit of trial and error, actually. Enjoy.