デザイナーさんとプログラマーさん向けに。
申請の必要なものもあるので注意が必要。
https://about.twitter.com/ja/company/brand-assets
Youtube
https://www.youtube.com/yt/brand/ja/using-logo.html
Google+
https://www.seeklogo.net/technology-logos/new-google-plus-icon-vector-73768.html
https://www.facebookbrand.com/
https://www.instagram.com/press/
ニコ動
http://commons.nicovideo.jp/search/tag/%E3%80%90%E5%85%AC%E5%BC%8F%E3%80%91%20%E3%80%90%E3%83%8B%E3%82%B3%E3%83%8B%E3%82%B3%E5%8B%95%E7%94%BB%E3%80%91
Vimeo
https://vimeo.com/about/brand_guidelines
https://business.pinterest.com/en/brand-guidelines
OKWave
http://www.okwave.co.jp/ri/about/logo/index.html
はてな
http://hatenacorp.jp/press/resource
Qiita
https://increments.zendesk.com/hc/ja/articles/204009729-%E3%83%96%E3%83%A9%E3%83%B3%E3%83%89%E3%82%AC%E3%82%A4%E3%83%89%E3%83%A9%E3%82%A4%E3%83%B3
GitHub
pixiv
http://www.pixiv.net/brand_terms.php
amazon
https://www.amazon.co.jp/gp/help/customer/display.html?ie=UTF8&nodeId=201748040
app-store
https://developer.apple.com/app-store/marketing/guidelines/jp/