Using Upperdog Interactive’s CSS Twitter logo as reference, and I wrote some circle-circle intersection code (a.k.a. math) to specify the Twitter logo as sequence of elliptical arc segments. There are other versions of the Twitter logo in SVG, but as best I can tell, they use cubic Béziers. I found it mathematically unsettling to use Béziers when circular arcs would suffice.
<!DOCTYPE html>
<meta charset="utf-8">
<style>
svg {
display: block;
height: 400px;
margin: 50px auto;
}
</style>
<svg viewBox="328 355 335 276" xmlns="//www.w3.org/2000/svg">
<path d="
M 630, 425
A 195, 195 0 0 1 331, 600
A 142, 142 0 0 0 428, 570
A 70, 70 0 0 1 370, 523
A 70, 70 0 0 0 401, 521
A 70, 70 0 0 1 344, 455
A 70, 70 0 0 0 372, 460
A 70, 70 0 0 1 354, 370
A 195, 195 0 0 0 495, 442
A 67, 67 0 0 1 611, 380
A 117, 117 0 0 0 654, 363
A 65, 65 0 0 1 623, 401
A 117, 117 0 0 0 662, 390
A 65, 65 0 0 1 630, 425
Z"
style="fill:#3BA9EE;"/>
</svg>