Don't waste your time seeking for those crisp-looking vector logo icons at various places. You have them all in one place here. You'll find them useful, I'm sure.
The logotypes are a free addition as part of my Flatilicious icons collection that you can find it here:
https://creativemarket.com/pixelbazaar/66057-Flatilicious-Icons?u=pixelbazaar
If you feel like donating for my effort, you can do it here: https://app.simplegoods.co/i/TDFSCCQK